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    <link:label id="lab_bokf_FairValueMeasurementPercentageOfAppraisedValueMinimum_52E9B8BA6FC31B037397073296D1804A_documentation_en-US" xlink:label="lab_bokf_FairValueMeasurementPercentageOfAppraisedValueMinimum_61215BFF8BB3584CA2ED211899B4EE1F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fair value of other real estate owned as a percentgage of appraised value, low end of range</link:label>
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    <link:label id="lab_bokf_FairValueMeasurementPercentageOfAppraisedValueMaximum_E9DBE2D88614B321A6EC073296D156F8_documentation_en-US" xlink:label="lab_bokf_FairValueMeasurementPercentageOfAppraisedValueMaximum_6141B4EACB8B575EB1168242D1BEA05D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fair value of other real estate owned as a percentgage of appraised value, high end of range</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_BF69883EB99F91E72ED7EBAAD9B632A2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ConsolidationItemsDomain_7D74FDDDB77F3B51C6A3EBAAD9B61881_label_en-US" xlink:label="lab_us-gaap_ConsolidationItemsDomain_7D74FDDDB77F3B51C6A3EBAAD9B61881" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_7D74FDDDB77F3B51C6A3EBAAD9B61881" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingSegmentsMember_77C5B3F5C2D6794C4D39EBAAD9B71678_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember_77C5B3F5C2D6794C4D39EBAAD9B71678" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Segments [Member]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_77C5B3F5C2D6794C4D39EBAAD9B71678" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingSegmentsMember_77C5B3F5C2D6794C4D39EBAAD9B71678" xlink:to="lab_us-gaap_OperatingSegmentsMember_77C5B3F5C2D6794C4D39EBAAD9B71678" xlink:type="arc" />
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    <link:label id="lab_us-gaap_CorporateNonSegmentMember_45877D5F2981415E104EEBAAD9B70A99_label_en-US" xlink:label="lab_us-gaap_CorporateNonSegmentMember_45877D5F2981415E104EEBAAD9B70A99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate, Non-Segment [Member]</link:label>
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    <link:label id="lab_bokf_CommercialMember_0E1558548955E4C3CA89EBAAD9B8143D_terseLabel_en-US" xlink:label="lab_bokf_CommercialMember_0E1558548955E4C3CA89EBAAD9B8143D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial [Member]</link:label>
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    <link:label id="lab_bokf_CommercialMember_0E1558548955E4C3CA89EBAAD9B8143D_documentation_en-US" xlink:label="lab_bokf_CommercialMember_0E1558548955E4C3CA89EBAAD9B8143D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Business segment-commercial customers.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingRevenueReconcilingItemLineItems" xlink:label="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2136141662016D264239EBAAD9B80F25" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2136141662016D264239EBAAD9B80F25" xlink:to="lab_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2136141662016D264239EBAAD9B80F25" xlink:type="arc" />
    <link:label id="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C_terseLabel_en-US" xlink:label="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net interest revenue from external sources</link:label>
    <link:label id="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C_label_en-US" xlink:label="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NIR (expense) from external sources</link:label>
    <link:label id="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C_documentation_en-US" xlink:label="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of interest revenue, primarily from loans and securities net of interest expense (cost of borrowed funds accounted for as interest) from external sources.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_NirExpenseFromExternalSources" xlink:label="loc_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C" xlink:to="lab_bokf_NirExpenseFromExternalSources_9D7EB1E9E3E15732BFC2EBAAD9B8250C" xlink:type="arc" />
    <link:label id="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70_terseLabel_en-US" xlink:label="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net interest revenue (expense) from internal sources</link:label>
    <link:label id="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70_label_en-US" xlink:label="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NIR (expense) from internal sources</link:label>
    <link:label id="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70_documentation_en-US" xlink:label="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of interest revenue earned or paid on funds loaned to or borrowed from the funds management unit net of interest expense (cost of borrowed funds accounted for as interest) from internal sources.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_NIRexpensefrominternalsources" xlink:label="loc_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70" xlink:to="lab_bokf_NIRexpensefrominternalsources_8509F489B8C9DEE10748EBAAD9B94F70" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4_totalLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net interest revenue</link:label>
    <link:label id="lab_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4_label_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Income (Expense), Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4" xlink:to="lab_us-gaap_InterestIncomeExpenseNet_CD0D0FC5A17037035B04EBAAD9B9DFC4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for credit losses</link:label>
    <link:label id="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689_label_en-US" xlink:label="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision for Loan, Lease, and Other Losses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689" xlink:to="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses_591D6FA3F4F9DCE1E3E7EBAAD9B99689" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A_terseLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net interest revenue after provision for credit losses</link:label>
    <link:label id="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A_label_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Income (Expense), after Provision for Loan Loss</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A" xlink:to="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_8A68C4931B82BCCC3F13EBAAD9B97B5A" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827_verboseLabel_en-US" xlink:label="lab_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other operating revenue</link:label>
    <link:label id="lab_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827_label_en-US" xlink:label="lab_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noninterest Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoninterestIncome" xlink:label="loc_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827" xlink:to="lab_us-gaap_NoninterestIncome_1A2A514E51B24BA29301EBAAD9B93827" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531_verboseLabel_en-US" xlink:label="lab_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other operating expense</link:label>
    <link:label id="lab_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531_label_en-US" xlink:label="lab_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noninterest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoninterestExpense" xlink:label="loc_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531" xlink:to="lab_us-gaap_NoninterestExpense_1D69D5BD40449BB7EF0CEBAAD9BA2531" xlink:type="arc" />
    <link:label id="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E_totalLabel_en-US" xlink:label="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net direct contribution</link:label>
    <link:label id="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E_label_en-US" xlink:label="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net direct contribution</link:label>
    <link:label id="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E_documentation_en-US" xlink:label="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net direct contribution of segments prior to corporate expense allocations.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_Netdirectcontribution" xlink:label="loc_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E" xlink:to="lab_bokf_Netdirectcontribution_E7A4823E7A1229B1F400EBAAD9BAF76E" xlink:type="arc" />
    <link:label id="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B_terseLabel_en-US" xlink:label="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on financial instruments, net</link:label>
    <link:label id="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B_label_en-US" xlink:label="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Financial Instruments, Net</link:label>
    <link:label id="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B_documentation_en-US" xlink:label="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents gain (loss) on financial instruments, net, used for segment reporting purposes on a summary basis. Includes those gains and losses from derivative contracts, fair value option securities and available for sale securities. Also includes in other-than-temporary impairment losses recognized in earnings.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_GainLossonFinancialInstrumentsNet" xlink:label="loc_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B" xlink:to="lab_bokf_GainLossonFinancialInstrumentsNet_E26C0D7EF780D908CA18EBAAD9BA585B" xlink:type="arc" />
    <link:label id="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C_terseLabel_en-US" xlink:label="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage servicing rights</link:label>
    <link:label id="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C_label_en-US" xlink:label="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting, Change in Fair Value of Mortgage Servicing Rights</link:label>
    <link:label id="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C_documentation_en-US" xlink:label="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the change in the fair value of mortgage servicing rights used for segment reporting purposes.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_SegmentReportingChangeinFairValueofMortgageServicingRights" xlink:label="loc_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C" xlink:to="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_6718A928A5650BA3756AEBAAD9BAD69C" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on repossessed assets, net</link:label>
    <link:label id="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5_label_en-US" xlink:label="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Sale of Assets and Asset Impairment Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5" xlink:to="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_8572D42B7CBF2DBB3041EBAAD9BA65B5" xlink:type="arc" />
    <link:label id="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46_terseLabel_en-US" xlink:label="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate expense allocations</link:label>
    <link:label id="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46_label_en-US" xlink:label="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate Expense Allocations</link:label>
    <link:label id="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46_documentation_en-US" xlink:label="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent allocation of corporate expenses to segments</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_CorporateExpenseAllocations" xlink:label="loc_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46" xlink:to="lab_bokf_CorporateExpenseAllocations_D687FAA23D2472199BF5EBAAD9BA1A46" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_A4E56AE536839E30A931EB5932E0F3D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_A4E56AE536839E30A931EB5932E0F3D9" xlink:to="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_A4E56AE536839E30A931EB5932E0F3D9" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4_terseLabel_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage</link:label>
    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4_label_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4" xlink:to="lab_us-gaap_ResidentialPortfolioSegmentMember_8D1291560ECCC8116D33EB5932E0ABE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7_terseLabel_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Personal</link:label>
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7_label_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consumer Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7" xlink:to="lab_us-gaap_ConsumerPortfolioSegmentMember_682F500B13FDADD283CFEB5932E07CF7" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Axis]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700" xlink:to="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_ADBEE5B1C167144C9D69EB5932E0B700" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Domain]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1" xlink:to="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_4E76D2F1B583766D325BEB5932E0B5C1" xlink:type="arc" />
    <link:label id="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515_terseLabel_en-US" xlink:label="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Energy [Member]</link:label>
    <link:label id="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515_label_en-US" xlink:label="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy [Member]</link:label>
    <link:label id="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515_documentation_en-US" xlink:label="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to energy industry</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_EnergyMember" xlink:label="loc_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515" xlink:to="lab_bokf_EnergyMember_C9397F3E4A84441437C9EB5932E12515" xlink:type="arc" />
    <link:label id="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02_terseLabel_en-US" xlink:label="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Energy Producers [Member]</link:label>
    <link:label id="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02_label_en-US" xlink:label="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy Producers [Member]</link:label>
    <link:label id="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02_documentation_en-US" xlink:label="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Energy Producers [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_EnergyProducersMember" xlink:label="loc_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02" xlink:to="lab_bokf_EnergyProducersMember_87D75E710A17135624A5EB5932E1DF02" xlink:type="arc" />
    <link:label id="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB_terseLabel_en-US" xlink:label="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Services [Member]</link:label>
    <link:label id="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB_label_en-US" xlink:label="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Services [Member]</link:label>
    <link:label id="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB_documentation_en-US" xlink:label="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to services industry</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicesMember" xlink:label="loc_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB" xlink:to="lab_bokf_ServicesMember_972703AC7A8551B90426EB5932E1FCAB" xlink:type="arc" />
    <link:label id="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1_terseLabel_en-US" xlink:label="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Healthcare [Member]</link:label>
    <link:label id="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1_label_en-US" xlink:label="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Healthcare [Member]</link:label>
    <link:label id="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1_documentation_en-US" xlink:label="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to healthcare industry.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_HealthcareMember" xlink:label="loc_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1" xlink:to="lab_bokf_HealthcareMember_F47DF6231243633F3793EB5932E1A9F1" xlink:type="arc" />
    <link:label id="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9_terseLabel_en-US" xlink:label="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Permanent mortgage [Member]</link:label>
    <link:label id="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9_label_en-US" xlink:label="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Permanent Residential Mortgage [Member]</link:label>
    <link:label id="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9_documentation_en-US" xlink:label="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to mortgages of permanent residences.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PermanentResidentialMortgageMember" xlink:label="loc_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9" xlink:to="lab_bokf_PermanentResidentialMortgageMember_E2F0DC29973E44014F10EB5932E2B8C9" xlink:type="arc" />
    <link:label id="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F_terseLabel_en-US" xlink:label="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Permanent mortgages guaranteed by US government agencies [Member]</link:label>
    <link:label id="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F_label_en-US" xlink:label="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Permanent Mortgages Guaranteed by US Government Agencies [Member]</link:label>
    <link:label id="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F_documentation_en-US" xlink:label="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to mortages for permanent residences guaranteed by U.S. government agencies.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember" xlink:label="loc_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F" xlink:to="lab_bokf_PermanentMortgagesGuaranteedByUsGovernmentAgenciesMember_3AFBABE404CFCD2ABB9AEB5932E2317F" xlink:type="arc" />
    <link:label id="lab_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C_terseLabel_en-US" xlink:label="lab_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity [Member]</link:label>
    <link:label id="lab_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C_label_en-US" xlink:label="lab_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home Equity Line of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HomeEquityMember" xlink:label="loc_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C" xlink:to="lab_us-gaap_HomeEquityMember_BE1ADB7C9AB78027EB4DEB5932E2EE6C" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementGeographicalAxis_CA042637AA00AB241503EB5932E22513_terseLabel_en-US" xlink:label="lab_us-gaap_StatementGeographicalAxis_CA042637AA00AB241503EB5932E22513" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementGeographicalAxis_CA042637AA00AB241503EB5932E22513_label_en-US" xlink:label="lab_us-gaap_StatementGeographicalAxis_CA042637AA00AB241503EB5932E22513" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_CA042637AA00AB241503EB5932E22513" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD_label_en-US" xlink:label="lab_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD" xlink:to="lab_us-gaap_SegmentGeographicalDomain_5253E99A3A48C65C522CEB5932E2FAAD" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageofLoanPortfolioAttributedtoTexas_A5C09FD9CF9176C488EFEB5932E5D2FB" xlink:to="lab_bokf_PercentageofLoanPortfolioAttributedtoTexas_A5C09FD9CF9176C488EFEB5932E5D2FB" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E_verboseLabel_en-US" xlink:label="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Percentage of loan portfolio attributed to Oklahoma (in hundredths)</link:label>
    <link:label id="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E_label_en-US" xlink:label="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Loan Portfolio Attributed to Oklahoma</link:label>
    <link:label id="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E_documentation_en-US" xlink:label="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reflects the percentage of the loan portfolio attributed to Oklahoma.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageofLoanPortfolioAttributedtoOklahoma" xlink:label="loc_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E" xlink:to="lab_bokf_PercentageofLoanPortfolioAttributedtoOklahoma_312681AF788870EB843FEB5932E6AA8E" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3_terseLabel_en-US" xlink:label="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of loan class to total loans</link:label>
    <link:label id="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3_label_en-US" xlink:label="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Loan Class to Total Loans</link:label>
    <link:label id="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3_documentation_en-US" xlink:label="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents percentage of given loan class to total loans.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageofLoanClasstoTotalLoans" xlink:label="loc_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3" xlink:to="lab_bokf_PercentageofLoanClasstoTotalLoans_7CE014B186F3F2A455E9EB5932E6EBE3" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A_terseLabel_en-US" xlink:label="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of committed energy production loans secured by oil</link:label>
    <link:label id="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A_label_en-US" xlink:label="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of committed energy production loans secured by oil</link:label>
    <link:label id="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A_documentation_en-US" xlink:label="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of committed energy production loans secured by properties primarily producing oil</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil" xlink:label="loc_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A" xlink:to="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByOil_AC47347A9509B6CF8E2AEB5932E6C87A" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30_terseLabel_en-US" xlink:label="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of committed energy production loans secured by natural gas</link:label>
    <link:label id="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30_label_en-US" xlink:label="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of committed energy production loans secured by natural gas</link:label>
    <link:label id="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30_documentation_en-US" xlink:label="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of committed energy production loans secured by properties producing natural gas</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas" xlink:label="loc_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30" xlink:to="lab_bokf_PercentageOfCommittedEnergyProductionLoansSecuredByNaturalGas_26599AC2501DCBF1BDC5EB5932E66D30" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800_verboseLabel_en-US" xlink:label="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amount of loans with individual balances less than $10 million</link:label>
    <link:label id="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800_label_en-US" xlink:label="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Amount Of Loans With Balances Below Threshold</link:label>
    <link:label id="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800_documentation_en-US" xlink:label="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum dollar amount of loans in this category with individual loan amount less than specified threshold.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumAmountOfLoansWithBalancesBelowThreshold" xlink:label="loc_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800" xlink:to="lab_bokf_MaximumAmountOfLoansWithBalancesBelowThreshold_5464EDAE15C517AEBD3AEB5932E66800" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E_verboseLabel_en-US" xlink:label="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum loan amount for certain individual loans in category</link:label>
    <link:label id="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E_label_en-US" xlink:label="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Loan Amount For Certain Individual Loans In Category</link:label>
    <link:label id="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E_documentation_en-US" xlink:label="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum loan amount for specified individual loans in category.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumLoanAmountForCertainIndividualLoansInCategory" xlink:label="loc_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E" xlink:to="lab_bokf_MaximumLoanAmountForCertainIndividualLoansInCategory_BC81AAEDDE4113B65E7FEB5932E7229E" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4_verboseLabel_en-US" xlink:label="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Percentage of loan portfolio secured by property in Texas (in hundredths)</link:label>
    <link:label id="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4_label_en-US" xlink:label="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Loan Portfolio Secured By Property in Texas</link:label>
    <link:label id="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4_documentation_en-US" xlink:label="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reflects the percentage of the loan in portfolio secured by property in the state of Texas.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas" xlink:label="loc_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4" xlink:to="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInTexas_CEE360922D6AE1BEA9DBEB5932E72CD4" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB_verboseLabel_en-US" xlink:label="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Percentage of loan portfolio secured by property in Oklahoma (in hundredths)</link:label>
    <link:label id="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB_label_en-US" xlink:label="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Loan Portfolio Secured By Property in Oklahoma</link:label>
    <link:label id="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB_documentation_en-US" xlink:label="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reflects the percentage of the loan in portfolio secured by property in the state of Oklahoma.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma" xlink:label="loc_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB" xlink:to="lab_bokf_PercentageOfLoanPortfolioSecuredByPropertyInOklahoma_3612D8496C0F0008B2E4EB5932E72CCB" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA_verboseLabel_en-US" xlink:label="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Minimum FICO required for jumbo loan approval</link:label>
    <link:label id="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA_label_en-US" xlink:label="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum FICO Required For Loan Approval</link:label>
    <link:label id="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA_documentation_en-US" xlink:label="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum FICO score required for loan approval.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MinimumFicoRequiredForLoanApproval" xlink:label="loc_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA" xlink:to="lab_bokf_MinimumFicoRequiredForLoanApproval_7D63D35ADF6DF64684DAEB5932E700DA" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403_verboseLabel_en-US" xlink:label="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum debt-to-income ratio on jumbo loans (in hundredths)</link:label>
    <link:label id="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403_label_en-US" xlink:label="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Debt To Income Ratio On Loans</link:label>
    <link:label id="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403_documentation_en-US" xlink:label="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum debt-to-income (DTI) ratio on loans approved.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumDebtToIncomeRatioOnLoans" xlink:label="loc_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403" xlink:to="lab_bokf_MaximumDebtToIncomeRatioOnLoans_01A8D93EF7ADD57D6E2EEB5932E7B403" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4_verboseLabel_en-US" xlink:label="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Minimum loan-to-value ratio on jumbo loans (in hundredths)</link:label>
    <link:label id="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4_label_en-US" xlink:label="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Loan To Value Ratio On Loans</link:label>
    <link:label id="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4_documentation_en-US" xlink:label="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum loan-to-value (LTV) ratio acceptable for loans to be approved.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MinimumLoanToValueRatioOnLoans" xlink:label="loc_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4" xlink:to="lab_bokf_MinimumLoanToValueRatioOnLoans_FAD3408160D131807002EB5932E7A5D4" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611_verboseLabel_en-US" xlink:label="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum loan-to-value ratio on jumbo loans (in hundredths)</link:label>
    <link:label id="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611_label_en-US" xlink:label="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Loan To Value Ratio On Loans</link:label>
    <link:label id="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611_documentation_en-US" xlink:label="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum loan-to-value (LTV) ratio on loans approved.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumLoanToValueRatioOnLoans" xlink:label="loc_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611" xlink:to="lab_bokf_MaximumLoanToValueRatioOnLoans_E82AC905A01139FAF5C4EB5932E87611" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59_verboseLabel_en-US" xlink:label="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Minimum period for fixed rate on variable rate jumbo loans (in years)</link:label>
    <link:label id="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59_label_en-US" xlink:label="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Period For Fixed Rate On Variable Rate Jumbo Residential Mortgage Loans</link:label>
    <link:label id="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59_documentation_en-US" xlink:label="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The minimum number o years that a variable rate jumbo residential mortgage loan will have a fixed rate of interest.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans" xlink:label="loc_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59" xlink:to="lab_bokf_MinimumPeriodForFixedRateOnVariableRateJumboResidentialMortgageLoans_66665A564B54AC565C08EB5932E89F59" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF_verboseLabel_en-US" xlink:label="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum period for fixed rate on variable rate jumbo loans (in years)</link:label>
    <link:label id="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF_label_en-US" xlink:label="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Period for Fixed Rate on Variable Rate Jumbo Residential Mortgage Loan</link:label>
    <link:label id="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF_documentation_en-US" xlink:label="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent the maximum number of years that a variable rate jumbo residential mortgage loan will have a fixed rate of interest.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan" xlink:label="loc_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF" xlink:to="lab_bokf_MaximumPeriodforFixedRateonVariableRateJumboResidentialMortgageLoan_5F24FD8DE8370FCFBEC3EB5932E88CFF" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D_terseLabel_en-US" xlink:label="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of home equity portfolio comprised of first lien loans</link:label>
    <link:label id="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D_label_en-US" xlink:label="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of home equity portfolio comprised of first lien loans</link:label>
    <link:label id="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D_documentation_en-US" xlink:label="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of home equity portfolio comprised of first lien loans</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans" xlink:label="loc_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D" xlink:to="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfFirstLienLoans_A6B8D00B60181653F995EB5932E8E40D" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816_terseLabel_en-US" xlink:label="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of home equity portfolio comprised of junior lien loans</link:label>
    <link:label id="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816_label_en-US" xlink:label="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of home equity portfolio comprised of junior lien loans</link:label>
    <link:label id="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816_documentation_en-US" xlink:label="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of home equity portfolio comprised of junior lien loans</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans" xlink:label="loc_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816" xlink:to="lab_bokf_PercentageOfHomeEquityPortfolioComprisedOfJuniorLienLoans_6F8BFA107BB4F9E31ABEEB5932E83816" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D_terseLabel_en-US" xlink:label="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of junior lien home equity loans that are amortizing term loans</link:label>
    <link:label id="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D_label_en-US" xlink:label="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of junior lien home equity loans that are amortizing term loans</link:label>
    <link:label id="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D_documentation_en-US" xlink:label="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of junior lien home equity loans that are amortizing term loans</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans" xlink:label="loc_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D" xlink:to="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreAmortizingTermLoans_E166B3D72A93873F0989EB5932E8596D" xlink:type="arc" />
    <link:label id="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6_terseLabel_en-US" xlink:label="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of junior lien home equity loans that are revolving lines of credit</link:label>
    <link:label id="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6_label_en-US" xlink:label="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of junior lien home equity loans that are revolving lines of credit</link:label>
    <link:label id="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6_documentation_en-US" xlink:label="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of junior lien home equity loans that are revolving lines of credit</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit" xlink:label="loc_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6" xlink:to="lab_bokf_PercentageOfJuniorLienHomeEquityLoansThatAreRevolvingLinesOfCredit_DD9859B53B221C7E632EEB5932E8AFB6" xlink:type="arc" />
    <link:label id="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A_terseLabel_en-US" xlink:label="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity loans, description</link:label>
    <link:label id="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A_label_en-US" xlink:label="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home equity loans, description</link:label>
    <link:label id="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A_documentation_en-US" xlink:label="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Describes the general components and status of home equity loans serviced by the entity outstanding as of the Balance Sheet date.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_HomeEquityLoansDescription" xlink:label="loc_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A" xlink:to="lab_bokf_HomeEquityLoansDescription_FA066AF6AAA80D7A9EECEB5932E9633A" xlink:type="arc" />
    <link:label id="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E_terseLabel_en-US" xlink:label="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity loans, maximum</link:label>
    <link:label id="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E_label_en-US" xlink:label="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home equity loans, maximum</link:label>
    <link:label id="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E_documentation_en-US" xlink:label="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The generally accepted maximum loan amount for a home equity loan issued by the Company.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_Homeequityloansmaximum" xlink:label="loc_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E" xlink:to="lab_bokf_Homeequityloansmaximum_29E790E6A59FB61E5838EB5932E9188E" xlink:type="arc" />
    <link:label id="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE_terseLabel_en-US" xlink:label="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity loans, revolving period</link:label>
    <link:label id="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE_label_en-US" xlink:label="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving Period for Home Equity Loans</link:label>
    <link:label id="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE_documentation_en-US" xlink:label="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the revolving period for home equity loans.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_RevolvingPeriodforHomeEquityLoans" xlink:label="loc_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE" xlink:to="lab_bokf_RevolvingPeriodforHomeEquityLoans_28C114EAA5BBF4A26D41EB5932E900EE" xlink:type="arc" />
    <link:label id="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A_terseLabel_en-US" xlink:label="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity loans, amortization period following revolving period</link:label>
    <link:label id="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A_label_en-US" xlink:label="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization Period Following Revolving Period for Home Equity Loans</link:label>
    <link:label id="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A_documentation_en-US" xlink:label="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amortization period of repayment following the revolving period for home equity loans.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans" xlink:label="loc_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A" xlink:to="lab_bokf_AmortizationPeriodFollowingRevolvingPeriodforHomeEquityLoans_CCC8BCBB01C62C967394EB5932E9BF5A" xlink:type="arc" />
    <link:label id="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B_terseLabel_en-US" xlink:label="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity loans, discretionary additional revolving period</link:label>
    <link:label id="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B_label_en-US" xlink:label="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home Equity Loans, Additional Discretionary Revolving Period</link:label>
    <link:label id="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B_documentation_en-US" xlink:label="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents additional revolving period that may be extended at the discretion of management following the initial revolving period for home equity loans.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod" xlink:label="loc_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B" xlink:to="lab_bokf_HomeEquityLoansAdditionalDiscretionaryRevolvingPeriod_B77AA0C25F08B3C4FB38EB5932E9E09B" xlink:type="arc" />
    <link:label id="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75_terseLabel_en-US" xlink:label="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Commitments [Abstract]</link:label>
    <link:label id="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75_label_en-US" xlink:label="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Commitments [Abstract]</link:label>
    <link:label id="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75_documentation_en-US" xlink:label="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_CreditCommitmentsAbstract" xlink:label="loc_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75" xlink:to="lab_bokf_CreditCommitmentsAbstract_A40C842C89EF2DB40BBFEB5932E90F75" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660_verboseLabel_en-US" xlink:label="lab_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Outstanding commitments to extend credit</link:label>
    <link:label id="lab_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660_label_en-US" xlink:label="lab_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unused Commitments to Extend Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnusedCommitmentsToExtendCredit" xlink:label="loc_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660" xlink:to="lab_us-gaap_UnusedCommitmentsToExtendCredit_0A7561996EA32CAC5C64EB5932EA8660" xlink:type="arc" />
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding standby letters of credit</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_0CD80444CB023FEB654DEB5932EA9974" xlink:type="arc" />
    <link:label id="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1_terseLabel_en-US" xlink:label="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Mortgage Servicing Rights [Abstract]</link:label>
    <link:label id="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1_label_en-US" xlink:label="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary of Mortgage Servicing Rights [Abstract]</link:label>
    <link:label id="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1_documentation_en-US" xlink:label="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_SummaryOfMortgageServicingRightsAbstract" xlink:label="loc_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1" xlink:to="lab_bokf_SummaryOfMortgageServicingRightsAbstract_DFB92109A74EC56D465EDC1A0B723CE1" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847_verboseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of residential mortgage loans serviced for others</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loans Serviced Number Of Loans</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Indicates the number of mortgage loans being serviced.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ResidentialMortgageLoansServicedNumberOfLoans" xlink:label="loc_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847" xlink:to="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_DCCDB307CC24ADA733F4DC1A0B72F847" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633_verboseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Outstanding principal balance of residential mortgage loans serviced for others</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loans Serviced Outstanding Principal</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dollar amount of principal outstanding on mortgage loans being serviced.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ResidentialMortgageLoansServicedOutstandingPrincipal" xlink:label="loc_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633" xlink:to="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_5ABDA85BB1C0A846B849DC1A0B726633" xlink:type="arc" />
    <link:label id="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C_terseLabel_en-US" xlink:label="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate</link:label>
    <link:label id="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C_label_en-US" xlink:label="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Interest Rate of Loans Serviced for Others</link:label>
    <link:label id="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C_documentation_en-US" xlink:label="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the weighted average interest rate of loans servicedf for others as of the balance sheet date.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_WeightedAverageInterestRateofLoansServicedforOthers" xlink:label="loc_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C" xlink:to="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_EABF443A66D6D619402DDC1A0B73898C" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining term (in months)</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loans Serviced Weighted Average Remaining Term</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the weighted average remaining term of mortgage loans being serviced fro others.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm" xlink:label="loc_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248" xlink:to="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_92BF28F6C3A01F1A1BD7DC1A0B735248" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Amount [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC_label_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Amount [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmountRollForward" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC" xlink:to="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_958130374FF134EEE514DC1A0B731FAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B_periodStartLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B_label_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmount" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B" xlink:to="lab_us-gaap_ServicingAssetAtFairValueAmount_25C9BB79D6C6C7F79F8BDC1A0B73F40B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions, net</link:label>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD_label_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Additions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetAtFairValueAdditions" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD" xlink:to="lab_us-gaap_ServicingAssetAtFairValueAdditions_F9BEA25482366E02BA1DDC1A0B736FAD" xlink:type="arc" />
    <link:label id="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D_terseLabel_en-US" xlink:label="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value due to principal payments</link:label>
    <link:label id="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D_label_en-US" xlink:label="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in fair value due to loan runoff</link:label>
    <link:label id="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D_documentation_en-US" xlink:label="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The decrease in fair value as a result of loan runoff.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ChangeInFairValueDueToLoanRunoff" xlink:label="loc_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D" xlink:to="lab_bokf_ChangeInFairValueDueToLoanRunoff_C41E494909F22056614FDC1A0B74E30D" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_BDDE8EF37AA278C75F9BDC1A0B7460A7_terseLabel_en-US" xlink:label="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_BDDE8EF37AA278C75F9BDC1A0B7460A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value due to market assumption changes</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions" xlink:label="loc_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_BDDE8EF37AA278C75F9BDC1A0B7460A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_BDDE8EF37AA278C75F9BDC1A0B7460A7" xlink:to="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_BDDE8EF37AA278C75F9BDC1A0B7460A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmount_0C459057BFCFE26BF4FFDC1A0B74DE5D_periodEndLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmount_0C459057BFCFE26BF4FFDC1A0B74DE5D" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Ending balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmount" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_0C459057BFCFE26BF4FFDC1A0B74DE5D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmount_0C459057BFCFE26BF4FFDC1A0B74DE5D" xlink:to="lab_us-gaap_ServicingAssetAtFairValueAmount_0C459057BFCFE26BF4FFDC1A0B74DE5D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]</link:label>
    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF_label_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract" xlink:label="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF" xlink:to="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_618E468F344DE5683B91DC1A0B74E3AF" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount rate - risk-free rate plus a market premium (in hundredths)</link:label>
    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1_label_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate" xlink:label="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1" xlink:to="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_CB60219866D32B56260FDC1A0B7462F1" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayment rate - based upon loan interest rate, original term and loan type, minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The minimum estimated speed of prepayments of principal on financial assets which may be one of the factors applied in estimating the fair value of servicing assets.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_B57F14B4F239EB0E01B1DC1A0B749A5A" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayment rate - based upon loan interest rate, original term and loan type, maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum estimated speed of prepayments of principal on financial assets which may be one of the factors applied in estimating the fair value of servicing assets.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_9390C2922676ECD6A901DC1A0B759700" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46_verboseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The minimum cost to service a performing loan for the period used as a variable in estimating fair value.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_900FBBBBF03488254E7CDC1A0B755E46" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F_verboseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum cost to service a performing loan for the period used as a variable in estimating fair value.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_0294C36E5D72909CC0EBDC1A0B75553F" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Service Cost Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Service Cost Minimum</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_5958952B096985733701DC1A0B754D2B" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Svc Cost Maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Delinquent</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_F90CABB2D3AEA443541ADC1A0B754D1F" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Minimum</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_340017765CCF6F401253DC1A0B75FED3" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum_C3A4AB110D58FECB2E23DC1A0B75F170_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum_C3A4AB110D58FECB2E23DC1A0B75F170" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan)</link:label>
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    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum_C3A4AB110D58FECB2E23DC1A0B75F170_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum_C3A4AB110D58FECB2E23DC1A0B75F170" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Maximum</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMaximum_C3A4AB110D58FECB2E23DC1A0B75F170" xlink:type="locator" />
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    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarningsRate_072D05930828BDF66BCCDC1A0B76AC5F_verboseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueEscrowEarningsRate_072D05930828BDF66BCCDC1A0B76AC5F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths)</link:label>
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    <link:label id="lab_bokf_Primarysecondarymortgageratespread_C4159AA0CFB96EFD65BADC1A0B76DD52_terseLabel_en-US" xlink:label="lab_bokf_Primarysecondarymortgageratespread_C4159AA0CFB96EFD65BADC1A0B76DD52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Primary secondary mortgage rate spread (in basis points)</link:label>
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    <link:label id="lab_bokf_Primarysecondarymortgageratespread_C4159AA0CFB96EFD65BADC1A0B76DD52_documentation_en-US" xlink:label="lab_bokf_Primarysecondarymortgageratespread_C4159AA0CFB96EFD65BADC1A0B76DD52" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mortgage rate spread between the primary and secondary market.</link:label>
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    <link:label id="lab_bokf_LoansAndAllowanceForCreditLossesAbstract_7B561998EEA92B1C71B3A53FD8CBF95B_label_en-US" xlink:label="lab_bokf_LoansAndAllowanceForCreditLossesAbstract_4D564F28879C592C8CD8B33BD0E9CE46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Allowance for Credit Losses [Abstract]</link:label>
    <link:label id="lab_bokf_LoansAndAllowanceForCreditLossesAbstract_7B561998EEA92B1C71B3A53FD8CBF95B_documentation_en-US" xlink:label="lab_bokf_LoansAndAllowanceForCreditLossesAbstract_4D564F28879C592C8CD8B33BD0E9CE46" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loans and Allowance for Credit Losses [Abstract]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_LoansAndAllowanceForCreditLossesAbstract" xlink:label="loc_bokf_LoansAndAllowanceForCreditLossesAbstract_4D564F28879C592C8CD8B33BD0E9CE46" xlink:type="locator" />
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    <link:label id="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_8126370869FFAA7C2288A53FD8CBAF55_terseLabel_en-US" xlink:label="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_A45AE7F8E25856398D2B10541531838F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_8126370869FFAA7C2288A53FD8CBAF55_label_en-US" xlink:label="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_A45AE7F8E25856398D2B10541531838F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Number of Days Past Due for a Non-Risk Graded Loan to be Placed on Nonaccruing Status</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_8126370869FFAA7C2288A53FD8CBAF55_documentation_en-US" xlink:label="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_A45AE7F8E25856398D2B10541531838F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of days past due a non-risk graded loan has to be in order to be placed on nonaccruing status.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus" xlink:label="loc_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_A45AE7F8E25856398D2B10541531838F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_A45AE7F8E25856398D2B10541531838F" xlink:to="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_A45AE7F8E25856398D2B10541531838F" xlink:type="arc" />
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_3D0C986070EC0B4BD212A53FD8CB71EB_terseLabel_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_C5865A77A1045891A88B97934713A98D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_3D0C986070EC0B4BD212A53FD8CB71EB_label_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_C5865A77A1045891A88B97934713A98D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_3D0C986070EC0B4BD212A53FD8CB71EB_documentation_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_C5865A77A1045891A88B97934713A98D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of days following notification of a borrowers Chapter 7 bankruptcy that a non-risk graded loan is placed on nonaccruing status.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus" xlink:label="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_C5865A77A1045891A88B97934713A98D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_C5865A77A1045891A88B97934713A98D" xlink:to="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_C5865A77A1045891A88B97934713A98D" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_EFFA014BA62B90504A16A53FD8CCF8C9_terseLabel_en-US" xlink:label="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_B802399EBFE353E2ACD2861B32842948" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans and Allowances for Credit Losses, Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_EFFA014BA62B90504A16A53FD8CCF8C9_label_en-US" xlink:label="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_B802399EBFE353E2ACD2861B32842948" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_EFFA014BA62B90504A16A53FD8CCF8C9_documentation_en-US" xlink:label="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_B802399EBFE353E2ACD2861B32842948" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Minimum number of days after which past due non-risk graded loans are charged off</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff" xlink:label="loc_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_B802399EBFE353E2ACD2861B32842948" xlink:type="locator" />
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    <link:label id="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_98511A679EBF9DC6AF7BA53FD8CC3798_terseLabel_en-US" xlink:label="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_5EDF14AE6EB15F96985CCF43221A969D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans and Allowances for Credit Losses, Maximum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_98511A679EBF9DC6AF7BA53FD8CC3798_label_en-US" xlink:label="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_5EDF14AE6EB15F96985CCF43221A969D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Max No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_98511A679EBF9DC6AF7BA53FD8CC3798_documentation_en-US" xlink:label="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_5EDF14AE6EB15F96985CCF43221A969D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum number of days after which past due non-risk graded loans are charged off</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff" xlink:label="loc_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_5EDF14AE6EB15F96985CCF43221A969D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_5EDF14AE6EB15F96985CCF43221A969D" xlink:to="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_5EDF14AE6EB15F96985CCF43221A969D" xlink:type="arc" />
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9DBB8AC3D5E36A5579ADA53FD8CCB944_terseLabel_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_94A3412D509759A9AEC3D74FACE5DD3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9DBB8AC3D5E36A5579ADA53FD8CCB944_label_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_94A3412D509759A9AEC3D74FACE5DD3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9DBB8AC3D5E36A5579ADA53FD8CCB944_documentation_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_94A3412D509759A9AEC3D74FACE5DD3D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of days after notification of Chapter 7 bankruptcy for a non-risk graded loan to be charged off</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff" xlink:label="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_94A3412D509759A9AEC3D74FACE5DD3D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareAbstract_5D60BA7B7943820661C5E90FEC42F874_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_5D60BA7B7943820661C5E90FEC42F874" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_5B93890B3CD68C3ACA49E90FEC5260A2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_6B922D201B5069B8A2D302CE43A49D30_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_1FF814EA4C645EF8B819D8E6481AFB88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Impaired Loans [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_6B922D201B5069B8A2D302CE43A49D30_label_en-US" xlink:label="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_1FF814EA4C645EF8B819D8E6481AFB88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Impaired Financing Receivable [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfImpairedFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_1FF814EA4C645EF8B819D8E6481AFB88" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_1FF814EA4C645EF8B819D8E6481AFB88" xlink:to="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_1FF814EA4C645EF8B819D8E6481AFB88" xlink:type="arc" />
    <link:label id="lab_bokf_WholesaleAndRetailMember_60AEC931AAFF29294B8902CE43A4AC46_terseLabel_en-US" xlink:label="lab_bokf_WholesaleAndRetailMember_80094112D2485144A092F561EBAA8A8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Wholesale/retail [Member]</link:label>
    <link:label id="lab_bokf_WholesaleAndRetailMember_60AEC931AAFF29294B8902CE43A4AC46_label_en-US" xlink:label="lab_bokf_WholesaleAndRetailMember_80094112D2485144A092F561EBAA8A8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wholesale and retail [Member]</link:label>
    <link:label id="lab_bokf_WholesaleAndRetailMember_60AEC931AAFF29294B8902CE43A4AC46_documentation_en-US" xlink:label="lab_bokf_WholesaleAndRetailMember_80094112D2485144A092F561EBAA8A8E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to wholesale/retail industry.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_WholesaleAndRetailMember" xlink:label="loc_bokf_WholesaleAndRetailMember_80094112D2485144A092F561EBAA8A8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_WholesaleAndRetailMember_80094112D2485144A092F561EBAA8A8E" xlink:to="lab_bokf_WholesaleAndRetailMember_80094112D2485144A092F561EBAA8A8E" xlink:type="arc" />
    <link:label id="lab_bokf_ManufacturingMember_5F19BDCBC34F4870BBCE02CE43A43CE7_terseLabel_en-US" xlink:label="lab_bokf_ManufacturingMember_FF06E36396AA5C4E8063C04DD63746D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Manufacturing [Member]</link:label>
    <link:label id="lab_bokf_ManufacturingMember_5F19BDCBC34F4870BBCE02CE43A43CE7_label_en-US" xlink:label="lab_bokf_ManufacturingMember_FF06E36396AA5C4E8063C04DD63746D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Manufacturing [Member]</link:label>
    <link:label id="lab_bokf_ManufacturingMember_5F19BDCBC34F4870BBCE02CE43A43CE7_documentation_en-US" xlink:label="lab_bokf_ManufacturingMember_FF06E36396AA5C4E8063C04DD63746D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to manufacturing industry.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ManufacturingMember" xlink:label="loc_bokf_ManufacturingMember_FF06E36396AA5C4E8063C04DD63746D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ManufacturingMember_FF06E36396AA5C4E8063C04DD63746D2" xlink:to="lab_bokf_ManufacturingMember_FF06E36396AA5C4E8063C04DD63746D2" xlink:type="arc" />
    <link:label id="lab_bokf_OtherCommercialAndIndustrialMember_053CD440A6277D8B887902CE43A40097_terseLabel_en-US" xlink:label="lab_bokf_OtherCommercialAndIndustrialMember_FCA8D3453A8E5E0B89BAAF7C73661376" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other commercial and industrial [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialAndIndustrialMember_053CD440A6277D8B887902CE43A40097_label_en-US" xlink:label="lab_bokf_OtherCommercialAndIndustrialMember_FCA8D3453A8E5E0B89BAAF7C73661376" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commercial and Industrial [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialAndIndustrialMember_053CD440A6277D8B887902CE43A40097_documentation_en-US" xlink:label="lab_bokf_OtherCommercialAndIndustrialMember_FCA8D3453A8E5E0B89BAAF7C73661376" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to other commercial and industrial industry.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_OtherCommercialAndIndustrialMember" xlink:label="loc_bokf_OtherCommercialAndIndustrialMember_FCA8D3453A8E5E0B89BAAF7C73661376" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_OtherCommercialAndIndustrialMember_FCA8D3453A8E5E0B89BAAF7C73661376" xlink:to="lab_bokf_OtherCommercialAndIndustrialMember_FCA8D3453A8E5E0B89BAAF7C73661376" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialconstructionandlanddevelopmentMember_1D0D7038013D5F7F748A02CE43A48AEA_terseLabel_en-US" xlink:label="lab_bokf_ResidentialconstructionandlanddevelopmentMember_DD3DB1B5A5A35665AF89E3F0B199A187" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential construction and land development [Member]</link:label>
    <link:label id="lab_bokf_ResidentialconstructionandlanddevelopmentMember_1D0D7038013D5F7F748A02CE43A48AEA_label_en-US" xlink:label="lab_bokf_ResidentialconstructionandlanddevelopmentMember_DD3DB1B5A5A35665AF89E3F0B199A187" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential construction and land development [Member]</link:label>
    <link:label id="lab_bokf_ResidentialconstructionandlanddevelopmentMember_1D0D7038013D5F7F748A02CE43A48AEA_documentation_en-US" xlink:label="lab_bokf_ResidentialconstructionandlanddevelopmentMember_DD3DB1B5A5A35665AF89E3F0B199A187" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Residential construction and land development [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ResidentialconstructionandlanddevelopmentMember" xlink:label="loc_bokf_ResidentialconstructionandlanddevelopmentMember_DD3DB1B5A5A35665AF89E3F0B199A187" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialconstructionandlanddevelopmentMember_DD3DB1B5A5A35665AF89E3F0B199A187" xlink:to="lab_bokf_ResidentialconstructionandlanddevelopmentMember_DD3DB1B5A5A35665AF89E3F0B199A187" xlink:type="arc" />
    <link:label id="lab_bokf_RetailMember_9EEB1522DD6DAB50F8B902CE43A4DB63_terseLabel_en-US" xlink:label="lab_bokf_RetailMember_79A3AB495C615617B43AC68087C643C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retail [Member]</link:label>
    <link:label id="lab_bokf_RetailMember_9EEB1522DD6DAB50F8B902CE43A4DB63_label_en-US" xlink:label="lab_bokf_RetailMember_79A3AB495C615617B43AC68087C643C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retail [Member]</link:label>
    <link:label id="lab_bokf_RetailMember_9EEB1522DD6DAB50F8B902CE43A4DB63_documentation_en-US" xlink:label="lab_bokf_RetailMember_79A3AB495C615617B43AC68087C643C8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables for which repayment will come from the sale or operation of retail facilities.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_RetailMember" xlink:label="loc_bokf_RetailMember_79A3AB495C615617B43AC68087C643C8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_RetailMember_79A3AB495C615617B43AC68087C643C8" xlink:to="lab_bokf_RetailMember_79A3AB495C615617B43AC68087C643C8" xlink:type="arc" />
    <link:label id="lab_bokf_OfficeMember_A66C42C6A88CE16E9A7D02CE43A45350_terseLabel_en-US" xlink:label="lab_bokf_OfficeMember_0CF14491A52E5CB19BE81D47866C26E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Office [Member]</link:label>
    <link:label id="lab_bokf_OfficeMember_A66C42C6A88CE16E9A7D02CE43A45350_label_en-US" xlink:label="lab_bokf_OfficeMember_0CF14491A52E5CB19BE81D47866C26E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Office [Member]</link:label>
    <link:label id="lab_bokf_OfficeMember_A66C42C6A88CE16E9A7D02CE43A45350_documentation_en-US" xlink:label="lab_bokf_OfficeMember_0CF14491A52E5CB19BE81D47866C26E6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related for which repayment will come from the sale or rental of office space.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_OfficeMember" xlink:label="loc_bokf_OfficeMember_0CF14491A52E5CB19BE81D47866C26E6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_OfficeMember_0CF14491A52E5CB19BE81D47866C26E6" xlink:to="lab_bokf_OfficeMember_0CF14491A52E5CB19BE81D47866C26E6" xlink:type="arc" />
    <link:label id="lab_us-gaap_MultifamilyMember_EB954D274EB88447540502CE43A43662_terseLabel_en-US" xlink:label="lab_us-gaap_MultifamilyMember_C54F1A8F508B5A0EB83FE021FB52E069" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Multifamily [Member]</link:label>
    <link:label id="lab_us-gaap_MultifamilyMember_EB954D274EB88447540502CE43A43662_label_en-US" xlink:label="lab_us-gaap_MultifamilyMember_C54F1A8F508B5A0EB83FE021FB52E069" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Multifamily [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MultifamilyMember" xlink:label="loc_us-gaap_MultifamilyMember_C54F1A8F508B5A0EB83FE021FB52E069" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MultifamilyMember_C54F1A8F508B5A0EB83FE021FB52E069" xlink:to="lab_us-gaap_MultifamilyMember_C54F1A8F508B5A0EB83FE021FB52E069" xlink:type="arc" />
    <link:label id="lab_bokf_IndustrialMember_54E24008902C009DD13902CE43A4BA60_terseLabel_en-US" xlink:label="lab_bokf_IndustrialMember_B977ECF2D27C5C18815845B97991D6FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Industrial [Member]</link:label>
    <link:label id="lab_bokf_IndustrialMember_54E24008902C009DD13902CE43A4BA60_label_en-US" xlink:label="lab_bokf_IndustrialMember_B977ECF2D27C5C18815845B97991D6FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Industrial [Member]</link:label>
    <link:label id="lab_bokf_IndustrialMember_54E24008902C009DD13902CE43A4BA60_documentation_en-US" xlink:label="lab_bokf_IndustrialMember_B977ECF2D27C5C18815845B97991D6FE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables for which repayment will come from the sale or rental of industrial facilities.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_IndustrialMember" xlink:label="loc_bokf_IndustrialMember_B977ECF2D27C5C18815845B97991D6FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_IndustrialMember_B977ECF2D27C5C18815845B97991D6FE" xlink:to="lab_bokf_IndustrialMember_B977ECF2D27C5C18815845B97991D6FE" xlink:type="arc" />
    <link:label id="lab_bokf_OtherCommercialRealEstateMember_B269ED9174741839A98A02CE43A4EDC5_terseLabel_en-US" xlink:label="lab_bokf_OtherCommercialRealEstateMember_C7BA7375D0E55694B8195F99B933CAAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other commercial real estate [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialRealEstateMember_B269ED9174741839A98A02CE43A4EDC5_label_en-US" xlink:label="lab_bokf_OtherCommercialRealEstateMember_C7BA7375D0E55694B8195F99B933CAAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commercial Real Estate [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialRealEstateMember_B269ED9174741839A98A02CE43A4EDC5_documentation_en-US" xlink:label="lab_bokf_OtherCommercialRealEstateMember_C7BA7375D0E55694B8195F99B933CAAD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables for which repyament is expected from the sale or rental of other commercial real estate properties.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_OtherCommercialRealEstateMember" xlink:label="loc_bokf_OtherCommercialRealEstateMember_C7BA7375D0E55694B8195F99B933CAAD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_OtherCommercialRealEstateMember_C7BA7375D0E55694B8195F99B933CAAD" xlink:to="lab_bokf_OtherCommercialRealEstateMember_C7BA7375D0E55694B8195F99B933CAAD" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableImpairedLineItems_0B1DD2491EA3150DF81A02CE43A41073_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableImpairedLineItems_E99329631DF25F8AB15C28CD0B39B8C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Impaired [Line Items]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableImpairedLineItems_0B1DD2491EA3150DF81A02CE43A41073_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableImpairedLineItems_E99329631DF25F8AB15C28CD0B39B8C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Impaired [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableImpairedLineItems" xlink:label="loc_us-gaap_FinancingReceivableImpairedLineItems_E99329631DF25F8AB15C28CD0B39B8C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_E99329631DF25F8AB15C28CD0B39B8C6" xlink:to="lab_us-gaap_FinancingReceivableImpairedLineItems_E99329631DF25F8AB15C28CD0B39B8C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_5558B5B51A85CF2886D202CE43A4D744_terseLabel_en-US" xlink:label="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_6B4AEA100E8B537AA825D7090580B671" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans [Abstract]</link:label>
    <link:label id="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_5558B5B51A85CF2886D202CE43A4D744_label_en-US" xlink:label="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_6B4AEA100E8B537AA825D7090580B671" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loan and Lease Receivables, Impaired [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoanAndLeaseReceivablesImpairedAbstract" xlink:label="loc_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_6B4AEA100E8B537AA825D7090580B671" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_6B4AEA100E8B537AA825D7090580B671" xlink:to="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_6B4AEA100E8B537AA825D7090580B671" xlink:type="arc" />
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_CF96D8C474A5D6C247BC02CE43A4A011_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_D57E4A05AA94531EBA6CE53A95BCEF82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans, unpaid principal balance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_CF96D8C474A5D6C247BC02CE43A4A011_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_D57E4A05AA94531EBA6CE53A95BCEF82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, Unpaid Principal Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_D57E4A05AA94531EBA6CE53A95BCEF82" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_D57E4A05AA94531EBA6CE53A95BCEF82" xlink:to="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_D57E4A05AA94531EBA6CE53A95BCEF82" xlink:type="arc" />
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    <link:label id="lab_bokf_PurchaseoffacilitiesfromprincipalssubjecttoSECNewJerseyproceedingsMember_74E3071794DD47EC2D83D86739FC7568_documentation_en-US" xlink:label="lab_bokf_PurchaseoffacilitiesfromprincipalssubjecttoSECNewJerseyproceedingsMember_74E3071794DD47EC2D83D86739FC7568" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchase of facilities from principals subject to SEC New Jersey proceedings [Member]</link:label>
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    <link:label id="lab_dei_EntityDomain_E43658198D1609EC4A6FD86739FC4335_label_en-US" xlink:label="lab_dei_EntityDomain_E43658198D1609EC4A6FD86739FC4335" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
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    <link:label id="lab_bokf_BokfEquityLlcMember_FB3DC8EF77EEDB4C9AB4D86739FC76BF_documentation_en-US" xlink:label="lab_bokf_BokfEquityLlcMember_FB3DC8EF77EEDB4C9AB4D86739FC76BF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">An indirect, wholly owned subsidiary of the entity that is the general partner of consolidated private equity funds.</link:label>
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    <link:label id="lab_bokf_NumberofVisaClassASharesVisaClassBSharesAreConvertibleTo_56B110711E520C36F897D86739FC029A_documentation_en-US" xlink:label="lab_bokf_NumberofVisaClassASharesVisaClassBSharesAreConvertibleTo_56B110711E520C36F897D86739FC029A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of Visa Class A shares that Visa Class B shares held by the Company are convertible to.</link:label>
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    <link:label id="lab_us-gaap_GainLossRelatedToLitigationSettlementAbstract_6067FA6EA30EB390FAC4D86739FCF731_label_en-US" xlink:label="lab_us-gaap_GainLossRelatedToLitigationSettlementAbstract_6067FA6EA30EB390FAC4D86739FCF731" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Settlement [Abstract]</link:label>
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    <link:label id="lab_bokf_Outstandingprincipalaccruedinterestandotheramountsrequiredbybonddocuments_D33B4D8E57D1FBB0701BD86739FC14E4_terseLabel_en-US" xlink:label="lab_bokf_Outstandingprincipalaccruedinterestandotheramountsrequiredbybonddocuments_D33B4D8E57D1FBB0701BD86739FC14E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding principal, accrued interest and other amounts required by bond documents</link:label>
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    <link:label id="lab_bokf_Disgorgedfees_AA1DA0BFF73D0B4F6E90D86739FCC2AE_terseLabel_en-US" xlink:label="lab_bokf_Disgorgedfees_AA1DA0BFF73D0B4F6E90D86739FCC2AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disgorged fees</link:label>
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    <link:label id="lab_bokf_Disgorgedfees_AA1DA0BFF73D0B4F6E90D86739FCC2AE_documentation_en-US" xlink:label="lab_bokf_Disgorgedfees_AA1DA0BFF73D0B4F6E90D86739FCC2AE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fees disgorged as a result of a settlement with a regulatory agency.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_7BC4448C44553E19459BD86739FCC914" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNumberOfPlaintiffs" xlink:label="loc_us-gaap_LossContingencyNumberOfPlaintiffs_17508F72EEC8F4E8EEA6D86739FC45D3" xlink:type="locator" />
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    <link:label id="lab_bokf_Allegedtotalofjudgmentagainstnursinghomeoperator_F0818272CF5BF926B5D8D86739FC4F2F_terseLabel_en-US" xlink:label="lab_bokf_Allegedtotalofjudgmentagainstnursinghomeoperator_F0818272CF5BF926B5D8D86739FC4F2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alleged total of judgment against nursing home operator</link:label>
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    <link:label id="lab_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_D88564D5790528D3715CD7DF78453E0D_terseLabel_en-US" xlink:label="lab_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_D88564D5790528D3715CD7DF78453E0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage servicing rights due to market changes</link:label>
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    <link:label id="lab_us-gaap_UnrealizedGainLossOnDerivatives_E6C13B75400EA172D953D7DF7845D6CF_negatedLabel_en-US" xlink:label="lab_us-gaap_UnrealizedGainLossOnDerivatives_E6C13B75400EA172D953D7DF7845D6CF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net unrealized losses (gains) from derivative contracts</link:label>
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    <link:label id="lab_bokf_Netgainonmortgageloansheldforsale_6C26A8EF480095B69032D7DF7846D11F_negatedLabel_en-US" xlink:label="lab_bokf_Netgainonmortgageloansheldforsale_6C26A8EF480095B69032D7DF7846D11F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net gain on mortgage loans held for sale</link:label>
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    <link:label id="lab_bokf_Netgainonmortgageloansheldforsale_6C26A8EF480095B69032D7DF7846D11F_documentation_en-US" xlink:label="lab_bokf_Netgainonmortgageloansheldforsale_6C26A8EF480095B69032D7DF7846D11F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the combined realized net gain from sale of residential mortgage loans and the change in the unrealized net gain on mortgage loans held for sale during the period.</link:label>
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    <link:label id="lab_bokf_Capitalizedmortgageservicingrights_E7180D9918EC7C71A47BD7DF7847A769_negatedTerseLabel_en-US" xlink:label="lab_bokf_Capitalizedmortgageservicingrights_E7180D9918EC7C71A47BD7DF7847A769" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Capitalized mortgage servicing rights</link:label>
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    <link:label id="lab_bokf_Capitalizedmortgageservicingrights_E7180D9918EC7C71A47BD7DF7847A769_documentation_en-US" xlink:label="lab_bokf_Capitalizedmortgageservicingrights_E7180D9918EC7C71A47BD7DF7847A769" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents non-cash adjustment to reconcile net income related to capitalization of mortgage servicing rights.</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_59704E63F4AAB08DE137D7DF7848CAFC_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_59704E63F4AAB08DE137D7DF7848CAFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from maturities or redemptions of available for sale securities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_D408712D1557685E6DA7D7DF7849B9C4" xlink:type="locator" />
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    <link:label id="lab_bokf_ChangeInAmountReceivableOnUnsettledSecurityTransactions_08B6FA26E06E17AE9F5DD7DF7849B4FF_verboseLabel_en-US" xlink:label="lab_bokf_ChangeInAmountReceivableOnUnsettledSecurityTransactions_08B6FA26E06E17AE9F5DD7DF7849B4FF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Change in amount receivable on unsettled available for sale securities transactions</link:label>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromLoansAndLeases_FDD561D174385A8D4C8AD7DF78494DAF_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromLoansAndLeases_FDD561D174385A8D4C8AD7DF78494DAF" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loans originated, net of principal collected</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9A2961FA85632A961000D7E08F29BF1D_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9A2961FA85632A961000D7E08F29BF1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions, net of cash acquired</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInTimeDeposits_5A367DCAA3351E109AA8D7DF784ABA79_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInTimeDeposits_5A367DCAA3351E109AA8D7DF784ABA79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in time deposits</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfDebt_4BB4E84FC69F639B25C1D7DF784AED7A_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfDebt_4BB4E84FC69F639B25C1D7DF784AED7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in other borrowed funds</link:label>
    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfDebt_4BB4E84FC69F639B25C1D7DF784AED7A_label_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfDebt_4BB4E84FC69F639B25C1D7DF784AED7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Repayments of) Debt</link:label>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities_C68694782EB7F8B3D223D7DF784B530B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities_C68694782EB7F8B3D223D7DF784B530B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Net proceeds on derivative liability contracts</link:label>
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    <link:label id="lab_bokf_NetChangeInDerivativeMarginAccounts_0090BFEAA44D47ADF099D7DF784BDD78_terseLabel_en-US" xlink:label="lab_bokf_NetChangeInDerivativeMarginAccounts_0090BFEAA44D47ADF099D7DF784BDD78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in derivative margin accounts</link:label>
    <link:label id="lab_bokf_NetChangeInDerivativeMarginAccounts_0090BFEAA44D47ADF099D7DF784BDD78_label_en-US" xlink:label="lab_bokf_NetChangeInDerivativeMarginAccounts_0090BFEAA44D47ADF099D7DF784BDD78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net change in derivative margin accounts</link:label>
    <link:label id="lab_bokf_NetChangeInDerivativeMarginAccounts_0090BFEAA44D47ADF099D7DF784BDD78_documentation_en-US" xlink:label="lab_bokf_NetChangeInDerivativeMarginAccounts_0090BFEAA44D47ADF099D7DF784BDD78" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net change in derivative margin accounts.</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_434E7C61CA4928E668F2D7DF784B8D56_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_434E7C61CA4928E668F2D7DF784B8D56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in amount due on unsettled available for sale securities transactions</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_6E69DF7312787E2AD4D7D7DF784B211D_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_6E69DF7312787E2AD4D7D7DF784B211D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of common and treasury stock, net</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_6E69DF7312787E2AD4D7D7DF784B211D_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_6E69DF7312787E2AD4D7D7DF784B211D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Common Stock</link:label>
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    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_653B15FF66B354D645A2D7DF784B858F_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_653B15FF66B354D645A2D7DF784B858F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase of common stock</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_653B15FF66B354D645A2D7DF784B858F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_AE1B284F1A3A683E69C0D7DF784B29B8_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_AE1B284F1A3A683E69C0D7DF784B29B8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Dividends paid</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_CE0C4436DED665AEFFBAD7DF784C497E_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_CE0C4436DED665AEFFBAD7DF784C497E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_CE0C4436DED665AEFFBAD7DF784C497E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_CE0C4436DED665AEFFBAD7DF784C497E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_0D2C917F5E8F9E12325AD7DF784C5082_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_0D2C917F5E8F9E12325AD7DF784C5082" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net increase (decrease) in cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_0262F7F57DF006B33979D7DF784CCB81_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_0262F7F57DF006B33979D7DF784CCB81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for interest</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92" xlink:to="lab_us-gaap_IncomeTaxesPaidNet_6AF39CDF572090DB5A40D7DF784DDB92" xlink:type="arc" />
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69_terseLabel_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loans and bank premises transferred to repossessed real estate and other assets</link:label>
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69_label_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Owned, Transfer to Real Estate Owned</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TransferToOtherRealEstate" xlink:label="loc_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69" xlink:to="lab_us-gaap_TransferToOtherRealEstate_BB692D0DFFD69E5F03C7D7DF784DFE69" xlink:type="arc" />
    <link:label id="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010_terseLabel_en-US" xlink:label="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period</link:label>
    <link:label id="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010_label_en-US" xlink:label="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase in U.S. government guaranteed loans eligible for repurchase</link:label>
    <link:label id="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010_documentation_en-US" xlink:label="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the non-cash increase in loans related to the right but not the obligation to repurchases loans previously sold into Ginnie Mae pools based on certain criteria and as such has effectively regained control of the asset and must recognize the loan on the balance sheet.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase" xlink:label="loc_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_BA2338AE443A83ABCBC9D7DF784D4010" xlink:type="locator" />
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    <link:label id="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2_terseLabel_en-US" xlink:label="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conveyance of other real estate owned guaranteed by U.S. government agencies</link:label>
    <link:label id="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2_label_en-US" xlink:label="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conveyance of other real estate owned guaranteed by US govt</link:label>
    <link:label id="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2_documentation_en-US" xlink:label="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents non-cash conveyance of other real estate owned guaranteed by U.S. government agencies during period.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt" xlink:label="loc_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2" xlink:to="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_59CD3CB848CB5D6E423ED7DF784D7FD2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_BBA097FFDDDF32A1C6AF049C970ED9E5_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_E5ABE8E748615DC5B63BCB5C615AFAD7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Financing Receivable, Allowance for Credit Losses [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_BBA097FFDDDF32A1C6AF049C970ED9E5_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_E5ABE8E748615DC5B63BCB5C615AFAD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Financing Receivable, Allowance for Credit Losses [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_E5ABE8E748615DC5B63BCB5C615AFAD7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_E5ABE8E748615DC5B63BCB5C615AFAD7" xlink:to="lab_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_E5ABE8E748615DC5B63BCB5C615AFAD7" xlink:type="arc" />
    <link:label id="lab_bokf_SpecificAllowanceMember_5417013E47E353B83B2D049C970E56D8_terseLabel_en-US" xlink:label="lab_bokf_SpecificAllowanceMember_62431B3C4D0B5D9ABBCABE4E72C4B7E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Specific Allowance [Member]</link:label>
    <link:label id="lab_bokf_SpecificAllowanceMember_5417013E47E353B83B2D049C970E56D8_label_en-US" xlink:label="lab_bokf_SpecificAllowanceMember_62431B3C4D0B5D9ABBCABE4E72C4B7E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Specific Allowance [Member]</link:label>
    <link:label id="lab_bokf_SpecificAllowanceMember_5417013E47E353B83B2D049C970E56D8_documentation_en-US" xlink:label="lab_bokf_SpecificAllowanceMember_62431B3C4D0B5D9ABBCABE4E72C4B7E5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing receivables and related allowance that have been spefically allocated to a portfolio segment.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_SpecificAllowanceMember" xlink:label="loc_bokf_SpecificAllowanceMember_62431B3C4D0B5D9ABBCABE4E72C4B7E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_SpecificAllowanceMember_62431B3C4D0B5D9ABBCABE4E72C4B7E5" xlink:to="lab_bokf_SpecificAllowanceMember_62431B3C4D0B5D9ABBCABE4E72C4B7E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnallocatedFinancingReceivablesMember_B0CD4289328E13DEEB5D049C970E515D_terseLabel_en-US" xlink:label="lab_us-gaap_UnallocatedFinancingReceivablesMember_A3546E6ED1D55092A57321F83FA058FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nonspecific Allowance [Member]</link:label>
    <link:label id="lab_us-gaap_UnallocatedFinancingReceivablesMember_B0CD4289328E13DEEB5D049C970E515D_label_en-US" xlink:label="lab_us-gaap_UnallocatedFinancingReceivablesMember_A3546E6ED1D55092A57321F83FA058FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unallocated Financing Receivables [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnallocatedFinancingReceivablesMember" xlink:label="loc_us-gaap_UnallocatedFinancingReceivablesMember_A3546E6ED1D55092A57321F83FA058FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnallocatedFinancingReceivablesMember_A3546E6ED1D55092A57321F83FA058FF" xlink:to="lab_us-gaap_UnallocatedFinancingReceivablesMember_A3546E6ED1D55092A57321F83FA058FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_08A2F7D8618EEB79AA5D049C970E8672_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_488B8469B88257B1B3BD43BAA24B0D72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Losses [Line Items]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_08A2F7D8618EEB79AA5D049C970E8672_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_488B8469B88257B1B3BD43BAA24B0D72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Losses [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_488B8469B88257B1B3BD43BAA24B0D72" xlink:type="locator" />
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    <link:label id="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_F21719E658913FA1D0B8049C970E2CF1_verboseLabel_en-US" xlink:label="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_CBBEA64F230C58F79FEBC869ABF0BA4A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Activity in allowance for credit losses [Abstract]</link:label>
    <link:label id="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_F21719E658913FA1D0B8049C970E2CF1_label_en-US" xlink:label="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_CBBEA64F230C58F79FEBC869ABF0BA4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Activity In Allowance For Credit Losses [Abstract]</link:label>
    <link:label id="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_F21719E658913FA1D0B8049C970E2CF1_documentation_en-US" xlink:label="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_CBBEA64F230C58F79FEBC869ABF0BA4A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ActivityInAllowanceForCreditLossesAbstract" xlink:label="loc_bokf_ActivityInAllowanceForCreditLossesAbstract_CBBEA64F230C58F79FEBC869ABF0BA4A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ActivityInAllowanceForCreditLossesAbstract_CBBEA64F230C58F79FEBC869ABF0BA4A" xlink:to="lab_bokf_ActivityInAllowanceForCreditLossesAbstract_CBBEA64F230C58F79FEBC869ABF0BA4A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_33BD5B1CC1FC43EAF55F049C970E255B_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_99E52D3667945DCDAF79D54E9006B089" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for loan losses [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_33BD5B1CC1FC43EAF55F049C970E255B_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_99E52D3667945DCDAF79D54E9006B089" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Losses [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_99E52D3667945DCDAF79D54E9006B089" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_99E52D3667945DCDAF79D54E9006B089" xlink:to="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_99E52D3667945DCDAF79D54E9006B089" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableAllowance_43EB1F4247835C475BEB049C970E7499_periodStartLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableAllowance_44257DB3F14F58A097D9087C76A9A0F3" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableAllowance_43EB1F4247835C475BEB049C970E7499_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableAllowance_44257DB3F14F58A097D9087C76A9A0F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Leases Receivable, Allowance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableAllowance" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_44257DB3F14F58A097D9087C76A9A0F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansAndLeasesReceivableAllowance_44257DB3F14F58A097D9087C76A9A0F3" xlink:to="lab_us-gaap_LoansAndLeasesReceivableAllowance_44257DB3F14F58A097D9087C76A9A0F3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProvisionForLoanAndLeaseLosses_82D2990FC838C73CDD88049C970EC7CC_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForLoanAndLeaseLosses_7B18E9236CE65FBAAB30AA4954318487" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for loan losses</link:label>
    <link:label id="lab_us-gaap_ProvisionForLoanAndLeaseLosses_82D2990FC838C73CDD88049C970EC7CC_label_en-US" xlink:label="lab_us-gaap_ProvisionForLoanAndLeaseLosses_7B18E9236CE65FBAAB30AA4954318487" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision for Loan and Lease Losses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_7B18E9236CE65FBAAB30AA4954318487" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProvisionForLoanAndLeaseLosses_7B18E9236CE65FBAAB30AA4954318487" xlink:to="lab_us-gaap_ProvisionForLoanAndLeaseLosses_7B18E9236CE65FBAAB30AA4954318487" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_0B4BF809DB738812721C049C970EE378_negatedLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_55390818B46F572FBB7CED0433644916" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loans charged off</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_0B4BF809DB738812721C049C970EE378_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_55390818B46F572FBB7CED0433644916" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Losses, Write-downs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_55390818B46F572FBB7CED0433644916" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NondesignatedMember_A60DD364E99576ED88E45A3BCE50735D_terseLabel_en-US" xlink:label="lab_us-gaap_NondesignatedMember_A1401F1AB46F549B862B486A6D1CD71A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Not Designated as Hedging Instrument [Member]</link:label>
    <link:label id="lab_us-gaap_NondesignatedMember_A60DD364E99576ED88E45A3BCE50735D_label_en-US" xlink:label="lab_us-gaap_NondesignatedMember_A1401F1AB46F549B862B486A6D1CD71A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Not Designated as Hedging Instrument [Member]</link:label>
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    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_1A6B66B3858651957C495A3BCE50BC37_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_5C1BE0382D2F52569714311E64FCA063" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_1A6B66B3858651957C495A3BCE50BC37_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_5C1BE0382D2F52569714311E64FCA063" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
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    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_E71F880D570792E036C85A3BCE50F7A6_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_ACF6E55814DE5779A57571971FF2EBC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Contract Type [Domain]</link:label>
    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_E71F880D570792E036C85A3BCE50F7A6_label_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_ACF6E55814DE5779A57571971FF2EBC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Contract [Domain]</link:label>
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    <link:label id="lab_bokf_TbaResidentialMortgageBackedSecuritiesMember_D2289236189500A567895A3BCE50D56F_terseLabel_en-US" xlink:label="lab_bokf_TbaResidentialMortgageBackedSecuritiesMember_0FF5303AF08C57BE8800C5D24F452599" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">To-be-announced residential mortgage-backed securities</link:label>
    <link:label id="lab_bokf_TbaResidentialMortgageBackedSecuritiesMember_D2289236189500A567895A3BCE50D56F_label_en-US" xlink:label="lab_bokf_TbaResidentialMortgageBackedSecuritiesMember_0FF5303AF08C57BE8800C5D24F452599" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TBA Residential Mortgage-Backed Securities [Member]</link:label>
    <link:label id="lab_bokf_TbaResidentialMortgageBackedSecuritiesMember_D2289236189500A567895A3BCE50D56F_documentation_en-US" xlink:label="lab_bokf_TbaResidentialMortgageBackedSecuritiesMember_0FF5303AF08C57BE8800C5D24F452599" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">To-be-announed residential mortgage-backed securities [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_TbaResidentialMortgageBackedSecuritiesMember" xlink:label="loc_bokf_TbaResidentialMortgageBackedSecuritiesMember_0FF5303AF08C57BE8800C5D24F452599" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestRateSwapMember_FD20551A9D38369C3FC95A3BCE50E150_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_3F0F6693651C53549E313C0DC7322112" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate swaps</link:label>
    <link:label id="lab_us-gaap_InterestRateSwapMember_FD20551A9D38369C3FC95A3BCE50E150_label_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_3F0F6693651C53549E313C0DC7322112" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_3F0F6693651C53549E313C0DC7322112" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EnergyRelatedDerivativeMember_AF951B893787582F377A5A3BCE508A47_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyRelatedDerivativeMember_45A7464B5FB1534385BA9245184A73CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Energy contracts</link:label>
    <link:label id="lab_us-gaap_EnergyRelatedDerivativeMember_AF951B893787582F377A5A3BCE508A47_label_en-US" xlink:label="lab_us-gaap_EnergyRelatedDerivativeMember_45A7464B5FB1534385BA9245184A73CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy Related Derivative [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EnergyRelatedDerivativeMember" xlink:label="loc_us-gaap_EnergyRelatedDerivativeMember_45A7464B5FB1534385BA9245184A73CC" xlink:type="locator" />
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    <link:label id="lab_bokf_AgriculturalContractsMember_5E718429E120CD91CC705A3BCE50A61E_terseLabel_en-US" xlink:label="lab_bokf_AgriculturalContractsMember_9796267D8BE0526299DA3B7DB7EFB2CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Agricultural contracts</link:label>
    <link:label id="lab_bokf_AgriculturalContractsMember_5E718429E120CD91CC705A3BCE50A61E_label_en-US" xlink:label="lab_bokf_AgriculturalContractsMember_9796267D8BE0526299DA3B7DB7EFB2CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agricultural Contracts [Member]</link:label>
    <link:label id="lab_bokf_AgriculturalContractsMember_5E718429E120CD91CC705A3BCE50A61E_documentation_en-US" xlink:label="lab_bokf_AgriculturalContractsMember_9796267D8BE0526299DA3B7DB7EFB2CB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Trading in a derivative instrument whose primary underlying risk is tied to agricultural commodity prices.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AgriculturalContractsMember_9796267D8BE0526299DA3B7DB7EFB2CB" xlink:to="lab_bokf_AgriculturalContractsMember_9796267D8BE0526299DA3B7DB7EFB2CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ForeignExchangeContractMember_BC8803B4517DA8114E0F5A3BCE50A9F5_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignExchangeContractMember_AAF92C069FB65BB6B55A1247042652A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign exchange contracts</link:label>
    <link:label id="lab_us-gaap_ForeignExchangeContractMember_BC8803B4517DA8114E0F5A3BCE50A9F5_label_en-US" xlink:label="lab_us-gaap_ForeignExchangeContractMember_AAF92C069FB65BB6B55A1247042652A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Exchange Contract [Member]</link:label>
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    <link:label id="lab_us-gaap_EquitySwapMember_1F6761BF05CBCE0DBA4C5A3BCE50C52A_terseLabel_en-US" xlink:label="lab_us-gaap_EquitySwapMember_C8B37C45BF90599F96989373C3B6BAC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity option contracts</link:label>
    <link:label id="lab_us-gaap_EquitySwapMember_1F6761BF05CBCE0DBA4C5A3BCE50C52A_label_en-US" xlink:label="lab_us-gaap_EquitySwapMember_C8B37C45BF90599F96989373C3B6BAC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Swap [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquitySwapMember" xlink:label="loc_us-gaap_EquitySwapMember_C8B37C45BF90599F96989373C3B6BAC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquitySwapMember_C8B37C45BF90599F96989373C3B6BAC7" xlink:to="lab_us-gaap_EquitySwapMember_C8B37C45BF90599F96989373C3B6BAC7" xlink:type="arc" />
    <link:label id="lab_bokf_CustomerRiskManagementProgramsMember_7E9CA08F09799C628E1F5A3BCE502571_terseLabel_en-US" xlink:label="lab_bokf_CustomerRiskManagementProgramsMember_4C1D7BEAC4E855229AD93C9AACC1B29B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total customer risk management programs</link:label>
    <link:label id="lab_bokf_CustomerRiskManagementProgramsMember_7E9CA08F09799C628E1F5A3BCE502571_label_en-US" xlink:label="lab_bokf_CustomerRiskManagementProgramsMember_4C1D7BEAC4E855229AD93C9AACC1B29B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Risk Management Programs [Member]</link:label>
    <link:label id="lab_bokf_CustomerRiskManagementProgramsMember_7E9CA08F09799C628E1F5A3BCE502571_documentation_en-US" xlink:label="lab_bokf_CustomerRiskManagementProgramsMember_4C1D7BEAC4E855229AD93C9AACC1B29B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents total derivative contracts in customer risk management programs.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_CustomerRiskManagementProgramsMember" xlink:label="loc_bokf_CustomerRiskManagementProgramsMember_4C1D7BEAC4E855229AD93C9AACC1B29B" xlink:type="locator" />
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    <link:label id="lab_bokf_InternalRiskManagementProgramsMember_39F4C006B601DCABAF6C5A3BCE50CCD7_terseLabel_en-US" xlink:label="lab_bokf_InternalRiskManagementProgramsMember_05AA3DAD1E8056C18001E520F0494192" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Internal risk management programs</link:label>
    <link:label id="lab_bokf_InternalRiskManagementProgramsMember_39F4C006B601DCABAF6C5A3BCE50CCD7_label_en-US" xlink:label="lab_bokf_InternalRiskManagementProgramsMember_05AA3DAD1E8056C18001E520F0494192" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Internal Risk Management Programs [Member]</link:label>
    <link:label id="lab_bokf_InternalRiskManagementProgramsMember_39F4C006B601DCABAF6C5A3BCE50CCD7_documentation_en-US" xlink:label="lab_bokf_InternalRiskManagementProgramsMember_05AA3DAD1E8056C18001E520F0494192" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents program to manage interest rate sensitivity, as part of its economic hedge of the changes in the fair value of mortgage servicing rights and as an economic hedge of trading securities.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_InternalRiskManagementProgramsMember" xlink:label="loc_bokf_InternalRiskManagementProgramsMember_05AA3DAD1E8056C18001E520F0494192" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_InternalRiskManagementProgramsMember_05AA3DAD1E8056C18001E520F0494192" xlink:to="lab_bokf_InternalRiskManagementProgramsMember_05AA3DAD1E8056C18001E520F0494192" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_9E8775AC7DD8E12979515A3BCE509982_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_3AE2A45862A458E49DC8408CBBD06E5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instruments, Gain (Loss) [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_9E8775AC7DD8E12979515A3BCE509982_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_3AE2A45862A458E49DC8408CBBD06E5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments, Gain (Loss) [Line Items]</link:label>
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    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNetAbstract_893341D4D662BE5D45F25A3BCE5064DA_label_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNetAbstract_225654FC3F4F5710B3EFDBD5C5596323" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Gain (Loss) on Derivative, Net [Abstract]</link:label>
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    <link:label id="lab_us-gaap_TradingGainsLosses_FE81D1F7835FB27CFE6E5A3BCE508927_terseLabel_en-US" xlink:label="lab_us-gaap_TradingGainsLosses_D72999FAA2C35924A468845D90B18BDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Brokergage and Trading Revenue</link:label>
    <link:label id="lab_us-gaap_TradingGainsLosses_FE81D1F7835FB27CFE6E5A3BCE508927_label_en-US" xlink:label="lab_us-gaap_TradingGainsLosses_D72999FAA2C35924A468845D90B18BDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Gain (Loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TradingGainsLosses" xlink:label="loc_us-gaap_TradingGainsLosses_D72999FAA2C35924A468845D90B18BDA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_832BF6DA33A151C50DF65A3BCE50A5BE_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_88712CB225EA5B628C4312B2AB52189C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Derivatives, Net</link:label>
    <link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_832BF6DA33A151C50DF65A3BCE50A5BE_label_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_88712CB225EA5B628C4312B2AB52189C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Gain (Loss) on Derivative, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_88712CB225EA5B628C4312B2AB52189C" xlink:type="locator" />
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    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_484379CA9D0C772C44715A3BCE403A82_terseLabel_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_FAEDF5D4954658CB8D09B1BEA11CB785" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Residential Mortgage Loans Held For Sale [Table]</link:label>
    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_484379CA9D0C772C44715A3BCE403A82_label_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_FAEDF5D4954658CB8D09B1BEA11CB785" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Residential Mortgage Loans Held For Sale [Table]</link:label>
    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_484379CA9D0C772C44715A3BCE403A82_documentation_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_FAEDF5D4954658CB8D09B1BEA11CB785" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable" xlink:label="loc_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_FAEDF5D4954658CB8D09B1BEA11CB785" xlink:type="locator" />
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    <link:label id="lab_bokf_ResidentialMortgageLoanCommitmentsMember_4577BA005C01115D864A5A3BCE40AA3C_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoanCommitmentsMember_F4AF7047AF8B50FF9FE45758A5C6F1F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loan Commitments [Member]</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoanCommitmentsMember_4577BA005C01115D864A5A3BCE40AA3C_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoanCommitmentsMember_F4AF7047AF8B50FF9FE45758A5C6F1F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loan Commitments [Member]</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoanCommitmentsMember_4577BA005C01115D864A5A3BCE40AA3C_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoanCommitmentsMember_F4AF7047AF8B50FF9FE45758A5C6F1F1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent contracts related to mortgage loan commitments to purchase.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ResidentialMortgageLoanCommitmentsMember" xlink:label="loc_bokf_ResidentialMortgageLoanCommitmentsMember_F4AF7047AF8B50FF9FE45758A5C6F1F1" xlink:type="locator" />
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    <link:label id="lab_bokf_ForwardSalesContractsMember_D2B47C19289A55255E065A3BCE409E6E_terseLabel_en-US" xlink:label="lab_bokf_ForwardSalesContractsMember_47207466BFEE50D8B1B3FBE637EFBEB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forward sales contracts [Member]</link:label>
    <link:label id="lab_bokf_ForwardSalesContractsMember_D2B47C19289A55255E065A3BCE409E6E_label_en-US" xlink:label="lab_bokf_ForwardSalesContractsMember_47207466BFEE50D8B1B3FBE637EFBEB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forward sales contracts [Member]</link:label>
    <link:label id="lab_bokf_ForwardSalesContractsMember_D2B47C19289A55255E065A3BCE409E6E_documentation_en-US" xlink:label="lab_bokf_ForwardSalesContractsMember_47207466BFEE50D8B1B3FBE637EFBEB3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents forward contracts to purchase mortgage loans.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ForwardSalesContractsMember" xlink:label="loc_bokf_ForwardSalesContractsMember_47207466BFEE50D8B1B3FBE637EFBEB3" xlink:type="locator" />
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    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_707D9C0B160D1D0712425A3BCE40CB0B_terseLabel_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_240274F023EE51A8B39AE2FAA5B2CF05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Residential Mortgage Loans Held For Sale [Line Items]</link:label>
    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_707D9C0B160D1D0712425A3BCE40CB0B_label_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_240274F023EE51A8B39AE2FAA5B2CF05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Residential Mortgage Loans Held For Sale [Line Items]</link:label>
    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_707D9C0B160D1D0712425A3BCE40CB0B_documentation_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_240274F023EE51A8B39AE2FAA5B2CF05" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems" xlink:label="loc_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_240274F023EE51A8B39AE2FAA5B2CF05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_240274F023EE51A8B39AE2FAA5B2CF05" xlink:to="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_240274F023EE51A8B39AE2FAA5B2CF05" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_88CADF61124E62379CCE5A3BCE409F50_terseLabel_en-US" xlink:label="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_1E7854A5146B5D83AB095593FB3E7A99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days outstanding for residential mortgage commitments, minimum (in days)</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_88CADF61124E62379CCE5A3BCE409F50_label_en-US" xlink:label="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_1E7854A5146B5D83AB095593FB3E7A99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Number of Days Outstanding For Residential Mortgage Commitments</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_88CADF61124E62379CCE5A3BCE409F50_documentation_en-US" xlink:label="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_1E7854A5146B5D83AB095593FB3E7A99" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents represents the typical minimum period for commitment to originate a residential mortgage loan to when the closed loan is sold to an investor.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments" xlink:label="loc_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_1E7854A5146B5D83AB095593FB3E7A99" xlink:type="locator" />
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    <link:label id="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_BE8765F7730512BD348D5A3BCE4009A7_terseLabel_en-US" xlink:label="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_60A05AC173385283922A940C8EF14696" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days outstanding for residential mortgage commitments, maximum (in days)</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_BE8765F7730512BD348D5A3BCE4009A7_label_en-US" xlink:label="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_60A05AC173385283922A940C8EF14696" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Number of Days Outstanding For Residential Mortgage Commitments</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_BE8765F7730512BD348D5A3BCE4009A7_documentation_en-US" xlink:label="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_60A05AC173385283922A940C8EF14696" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents represents the typical maximum period for commitment to originate a residential mortgage loan to when the closed loan is sold to an investor.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments" xlink:label="loc_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_60A05AC173385283922A940C8EF14696" xlink:type="locator" />
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    <link:label id="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_8D1365FE993E5E45ECAF5A3BCE40DD35_terseLabel_en-US" xlink:label="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_257746A5A0C7568EA47107B727289E85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days for delivery of loans, for which the price is set by forward sales contracts, minimum (in days)</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_8D1365FE993E5E45ECAF5A3BCE40DD35_label_en-US" xlink:label="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_257746A5A0C7568EA47107B727289E85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Number of Days for Delivery of Forward Sales Contracts</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_8D1365FE993E5E45ECAF5A3BCE40DD35_documentation_en-US" xlink:label="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_257746A5A0C7568EA47107B727289E85" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum number of days from the point of pricing being set to delivery of forward sales contracts.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts" xlink:label="loc_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_257746A5A0C7568EA47107B727289E85" xlink:type="locator" />
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    <link:label id="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_1306955E6BB69760DD745A3BCE4083BC_terseLabel_en-US" xlink:label="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_9CCD0D2D1ABD56CF8BF3030F1A1C0031" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days for delivery for loans, for which the price is set by forward sales contracts, maximum (in days)</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_1306955E6BB69760DD745A3BCE4083BC_label_en-US" xlink:label="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_9CCD0D2D1ABD56CF8BF3030F1A1C0031" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Number of Days for Delivery of Forward Sales Contracts</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_1306955E6BB69760DD745A3BCE4083BC_documentation_en-US" xlink:label="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_9CCD0D2D1ABD56CF8BF3030F1A1C0031" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents represents the typical maximum number of days from the point pricing is set to delivery of forward sales contracts.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts" xlink:label="loc_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_9CCD0D2D1ABD56CF8BF3030F1A1C0031" xlink:type="locator" />
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    <link:label id="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_3B30CE140EB97BF8213B5A3BCE40FB9D_verboseLabel_en-US" xlink:label="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_7E911CCA56E750E28E48CEA949CE4FFB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of days for past due for loan to be considered nonperforming (in days)</link:label>
    <link:label id="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_3B30CE140EB97BF8213B5A3BCE40FB9D_label_en-US" xlink:label="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_7E911CCA56E750E28E48CEA949CE4FFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Days For Past Due Residential Mortgage Loans Held for Sale</link:label>
    <link:label id="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_3B30CE140EB97BF8213B5A3BCE40FB9D_documentation_en-US" xlink:label="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_7E911CCA56E750E28E48CEA949CE4FFB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of days past due for residential mortgage loans held for sale to be reported as delinquent.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale" xlink:label="loc_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_7E911CCA56E750E28E48CEA949CE4FFB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_7E911CCA56E750E28E48CEA949CE4FFB" xlink:to="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_7E911CCA56E750E28E48CEA949CE4FFB" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_27C8A499898162BBFF885A3BCE40711E_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_A4FF9EBA9DF558BC9F1F77F17BD1C865" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale, nonperforming</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_27C8A499898162BBFF885A3BCE40711E_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_A4FF9EBA9DF558BC9F1F77F17BD1C865" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale, nonperforming</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_27C8A499898162BBFF885A3BCE40711E_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_A4FF9EBA9DF558BC9F1F77F17BD1C865" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale, 90 days past due or impaired.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_ResidentialMortgageLoansHeldForSaleNonperforming" xlink:label="loc_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_A4FF9EBA9DF558BC9F1F77F17BD1C865" xlink:type="locator" />
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    <link:label id="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_9B7CFC0EC679B3DDDDFE5A3BCE40290D_terseLabel_en-US" xlink:label="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7777E800FB3358FB86949E84058D7361" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit losses recognized on residential mortgage loans held for sale</link:label>
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    <link:label id="lab_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_FD83ADF40F10D70E56E6ED14A911644F_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_FD83ADF40F10D70E56E6ED14A911644F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Brokerage and trading revenue</link:label>
    <link:label id="lab_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_FD83ADF40F10D70E56E6ED14A911644F_label_en-US" xlink:label="lab_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_FD83ADF40F10D70E56E6ED14A911644F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions" xlink:label="loc_us-gaap_InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions_FD83ADF40F10D70E56E6ED14A911644F" xlink:type="locator" />
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    <link:label id="lab_bokf_Transactioncardrevenue_350929E5415122CD8B43ED1AFE5A229F_terseLabel_en-US" xlink:label="lab_bokf_Transactioncardrevenue_350929E5415122CD8B43ED1AFE5A229F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transaction card revenue</link:label>
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    <link:label id="lab_us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities_1F0FA7F9CF77A0764A8CED14A911F37D_terseLabel_en-US" xlink:label="lab_us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities_1F0FA7F9CF77A0764A8CED14A911F37D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fiduciary and asset management revenue</link:label>
    <link:label id="lab_us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities_1F0FA7F9CF77A0764A8CED14A911F37D_label_en-US" xlink:label="lab_us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities_1F0FA7F9CF77A0764A8CED14A911F37D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fees and Commissions, Fiduciary and Trust Activities</link:label>
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    <link:label id="lab_us-gaap_FeesAndCommissionsDepositorAccounts_F29CCA2F1EBEA6AD0ACDED14A9115A78_terseLabel_en-US" xlink:label="lab_us-gaap_FeesAndCommissionsDepositorAccounts_F29CCA2F1EBEA6AD0ACDED14A9115A78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deposit service charges and fees</link:label>
    <link:label id="lab_us-gaap_FeesAndCommissionsDepositorAccounts_F29CCA2F1EBEA6AD0ACDED14A9115A78_label_en-US" xlink:label="lab_us-gaap_FeesAndCommissionsDepositorAccounts_F29CCA2F1EBEA6AD0ACDED14A9115A78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fees and Commissions, Depositor Accounts</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FeesAndCommissionsDepositorAccounts" xlink:label="loc_us-gaap_FeesAndCommissionsDepositorAccounts_F29CCA2F1EBEA6AD0ACDED14A9115A78" xlink:type="locator" />
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    <link:label id="lab_bokf_MortgageBankingRevenue_40B4BDF6715E74D118D4ED14A911168C_terseLabel_en-US" xlink:label="lab_bokf_MortgageBankingRevenue_40B4BDF6715E74D118D4ED14A911168C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgage banking revenue</link:label>
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    <link:label id="lab_bokf_TotalFeesAndCommissions_D42E61783F1772D56113ED14A912ABA1_documentation_en-US" xlink:label="lab_bokf_TotalFeesAndCommissions_D42E61783F1772D56113ED14A912ABA1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total fees and commissions earned from providing services such as maintaining: depositor accounts; fiduciary and trust; brokerage and underwriting; mortgage; transaction cards; and other revenue such as bank owned life insurance.</link:label>
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    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets1_CEA7334A25DF0FC3138FED14A912AF7C_verboseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets1_CEA7334A25DF0FC3138FED14A912AF7C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other gains, net</link:label>
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    <link:label id="lab_bokf_GainOnFairValueOptionSecuritiesNet_FE4F14DE4E268FDCEF6EED14A912EC63_terseLabel_en-US" xlink:label="lab_bokf_GainOnFairValueOptionSecuritiesNet_FE4F14DE4E268FDCEF6EED14A912EC63" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on fair value option securities, net</link:label>
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    <link:label id="lab_bokf_GainOnFairValueOptionSecuritiesNet_FE4F14DE4E268FDCEF6EED14A912EC63_documentation_en-US" xlink:label="lab_bokf_GainOnFairValueOptionSecuritiesNet_FE4F14DE4E268FDCEF6EED14A912EC63" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gain (loss) included in earning for the period related fair value option securities primarily held as an economic hedge of the changes in the fair value of mortgage servicing rights.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_656E41FC8C5C2B087E9DED14A9162F6A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_3A3FEEBD044CDF230A60ED14A9168D2E_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_3A3FEEBD044CDF230A60ED14A9168D2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average shares used in computation: [Abstract]</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_3A3FEEBD044CDF230A60ED14A9168D2E_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_3A3FEEBD044CDF230A60ED14A9168D2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic [Abstract]</link:label>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_46C669BA73BE52F66D2EED14A9166A1C_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_46C669BA73BE52F66D2EED14A9166A1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_46C669BA73BE52F66D2EED14A9166A1C" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_CEE38F8D169EEF866727ED14A9177301" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_64DC1CB978FE4F8F8319ED14A917ADED_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared_64DC1CB978FE4F8F8319ED14A917ADED" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Dividends declared per share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_64DC1CB978FE4F8F8319ED14A917ADED" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_90307E047A70F3D3933B6F1A2A3513AF_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_C87C6B6A5792528ABC8C0225F4A768B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Recurring [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_C87C6B6A5792528ABC8C0225F4A768B4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AvailableforsaleSecuritiesMember_5B0D57448960E9D8931B6F1A2A359D4F_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableforsaleSecuritiesMember_28F65BB7594E5BFBB8F33220B35FD236" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale securities [Member]</link:label>
    <link:label id="lab_us-gaap_AvailableforsaleSecuritiesMember_5B0D57448960E9D8931B6F1A2A359D4F_label_en-US" xlink:label="lab_us-gaap_AvailableforsaleSecuritiesMember_28F65BB7594E5BFBB8F33220B35FD236" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableforsaleSecuritiesMember" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesMember_28F65BB7594E5BFBB8F33220B35FD236" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableforsaleSecuritiesMember_28F65BB7594E5BFBB8F33220B35FD236" xlink:to="lab_us-gaap_AvailableforsaleSecuritiesMember_28F65BB7594E5BFBB8F33220B35FD236" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldforSaleMember_75D657FA97D5FAA9263E6F1A2A35F3BB_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldforSaleMember_CEC8B4B934E85647BE8DB50976761013" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale [Member]</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_33D830698BD13C9CC45F6F1A2A35AACB_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_4A82851DF6FA5BBFBF46633191EA10FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_66DBE36B7A03B8EE07A76F1A2A354277_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_156979AB352658D59D34ED9CD28742FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_66DBE36B7A03B8EE07A76F1A2A354277_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_156979AB352658D59D34ED9CD28742FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_156979AB352658D59D34ED9CD28742FF" xlink:type="locator" />
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    <link:label id="lab_bokf_MortgagebankingrevenueMember_EFFD142A97AA3EB83C236F1A2A35DB57_terseLabel_en-US" xlink:label="lab_bokf_MortgagebankingrevenueMember_3BC8FD6C09FE59A79CC4C416E48444BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgage banking revenue [Member]</link:label>
    <link:label id="lab_bokf_MortgagebankingrevenueMember_EFFD142A97AA3EB83C236F1A2A35DB57_label_en-US" xlink:label="lab_bokf_MortgagebankingrevenueMember_3BC8FD6C09FE59A79CC4C416E48444BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage banking revenue [Member]</link:label>
    <link:label id="lab_bokf_MortgagebankingrevenueMember_EFFD142A97AA3EB83C236F1A2A35DB57_documentation_en-US" xlink:label="lab_bokf_MortgagebankingrevenueMember_3BC8FD6C09FE59A79CC4C416E48444BF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents Mortgage banking revenue income statement line item.</link:label>
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    <link:label id="lab_bokf_InvestmentbankingrevenueMember_CC2F481CBC5C12CFB9F6941DAB706AC5_label_en-US" xlink:label="lab_bokf_InvestmentbankingrevenueMember_CC2F481CBC5C12CFB9F6941DAB706AC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment banking revenue [Member]</link:label>
    <link:label id="lab_bokf_InvestmentbankingrevenueMember_CC2F481CBC5C12CFB9F6941DAB706AC5_documentation_en-US" xlink:label="lab_bokf_InvestmentbankingrevenueMember_CC2F481CBC5C12CFB9F6941DAB706AC5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment banking revenue [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_InvestmentbankingrevenueMember" xlink:label="loc_bokf_InvestmentbankingrevenueMember_CC2F481CBC5C12CFB9F6941DAB706AC5" xlink:type="locator" />
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    <link:label id="lab_bokf_TransactioncardrevenueMember_A87C77404DCC199B336A941DAB70A7E5_label_en-US" xlink:label="lab_bokf_TransactioncardrevenueMember_A87C77404DCC199B336A941DAB70A7E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transaction card revenue [Member]</link:label>
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    <link:label id="lab_bokf_TransFundEFTnetworkrevenueMember_9FC58DA5ACE94FFDE1B2941DAB7095D5_documentation_en-US" xlink:label="lab_bokf_TransFundEFTnetworkrevenueMember_9FC58DA5ACE94FFDE1B2941DAB7095D5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TransFund EFT network revenue [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_TransFundEFTnetworkrevenueMember" xlink:label="loc_bokf_TransFundEFTnetworkrevenueMember_9FC58DA5ACE94FFDE1B2941DAB7095D5" xlink:type="locator" />
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    <link:label id="lab_bokf_MerchantservicesrevenueMember_633DBC46FF0FA68D5BA0941DAB705617_documentation_en-US" xlink:label="lab_bokf_MerchantservicesrevenueMember_633DBC46FF0FA68D5BA0941DAB705617" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Merchant services revenue [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MerchantservicesrevenueMember" xlink:label="loc_bokf_MerchantservicesrevenueMember_633DBC46FF0FA68D5BA0941DAB705617" xlink:type="locator" />
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    <link:label id="lab_bokf_FiduciaryandassetmanagementrevenueMember_ED91829B982C201BF908941DAB705D58_label_en-US" xlink:label="lab_bokf_FiduciaryandassetmanagementrevenueMember_ED91829B982C201BF908941DAB705D58" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fiduciary and asset management revenue [Member]</link:label>
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    <link:loc xlink:href="bokf-20180630.xsd#bokf_FiduciaryandassetmanagementrevenueMember" xlink:label="loc_bokf_FiduciaryandassetmanagementrevenueMember_ED91829B982C201BF908941DAB705D58" xlink:type="locator" />
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    <link:loc xlink:href="bokf-20180630.xsd#bokf_PersonaltrustrevenueMember" xlink:label="loc_bokf_PersonaltrustrevenueMember_506C905907A61387F695941DAB71EBF5" xlink:type="locator" />
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    <link:label id="lab_bokf_CorporatetrustrevenueMember_2B2F3367897536E05328941DAB71259C_label_en-US" xlink:label="lab_bokf_CorporatetrustrevenueMember_2B2F3367897536E05328941DAB71259C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate trust revenue [Member]</link:label>
    <link:label id="lab_bokf_CorporatetrustrevenueMember_2B2F3367897536E05328941DAB71259C_documentation_en-US" xlink:label="lab_bokf_CorporatetrustrevenueMember_2B2F3367897536E05328941DAB71259C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Corporate trust revenue [Member]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_CorporatetrustrevenueMember" xlink:label="loc_bokf_CorporatetrustrevenueMember_2B2F3367897536E05328941DAB71259C" xlink:type="locator" />
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    <link:label id="lab_bokf_InstitutionaltrustretirementplanservicesrevenueMember_0B477FC61429CAE6E298941DAB71CAFC_terseLabel_en-US" xlink:label="lab_bokf_InstitutionaltrustretirementplanservicesrevenueMember_0B477FC61429CAE6E298941DAB71CAFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Institutional trust &amp; retirement plan services revenue [Member]</link:label>
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    <link:loc xlink:href="bokf-20180630.xsd#bokf_InstitutionaltrustretirementplanservicesrevenueMember" xlink:label="loc_bokf_InstitutionaltrustretirementplanservicesrevenueMember_0B477FC61429CAE6E298941DAB71CAFC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetBackedSecuritiesMember_C455274E03872E5811CAED14A6EB2A88_terseLabel_en-US" xlink:label="lab_us-gaap_AssetBackedSecuritiesMember_C455274E03872E5811CAED14A6EB2A88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset-backed securities</link:label>
    <link:label id="lab_us-gaap_AssetBackedSecuritiesMember_C455274E03872E5811CAED14A6EB2A88_label_en-US" xlink:label="lab_us-gaap_AssetBackedSecuritiesMember_C455274E03872E5811CAED14A6EB2A88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset-backed Securities [Member]</link:label>
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    <link:label id="lab_us-gaap_USTreasurySecuritiesMember_4234B596C5FB8D997621ED14A6EB310F_terseLabel_en-US" xlink:label="lab_us-gaap_USTreasurySecuritiesMember_4234B596C5FB8D997621ED14A6EB310F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">U.S. Treasury</link:label>
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    <link:label id="lab_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_3AC94D696755D37B6A6DED14A6EC7230_terseLabel_en-US" xlink:label="lab_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_3AC94D696755D37B6A6DED14A6EC7230" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Privately issued residential mortgage-backed securities</link:label>
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    <link:label id="lab_us-gaap_CommercialMortgageBackedSecuritiesMember_54DF93A7773A1D019C67ED14A6ECDFB5_terseLabel_en-US" xlink:label="lab_us-gaap_CommercialMortgageBackedSecuritiesMember_54DF93A7773A1D019C67ED14A6ECDFB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial mortgage-backed securities guaranteed by U.S. government agencies</link:label>
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    <link:label id="lab_us-gaap_PreferredStockMember_08FC248A21CB9870E89AED14A6ECEED4_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockMember_08FC248A21CB9870E89AED14A6ECEED4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Perpetual preferred stock</link:label>
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    <link:label id="lab_bokf_EquitySecuritiesAndMutualFundsMember_432E83582D8A5EAFAE0FED14A6EC4F4E_terseLabel_en-US" xlink:label="lab_bokf_EquitySecuritiesAndMutualFundsMember_432E83582D8A5EAFAE0FED14A6EC4F4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity securities and mutual funds</link:label>
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    <link:label id="lab_bokf_EquitySecuritiesAndMutualFundsMember_432E83582D8A5EAFAE0FED14A6EC4F4E_documentation_en-US" xlink:label="lab_bokf_EquitySecuritiesAndMutualFundsMember_432E83582D8A5EAFAE0FED14A6EC4F4E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This category includes information about ownership interests or the right to acquire ownership interests in corporations and mutual funds.</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_9187C239E2107D11465AED14A6ED081E_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_9187C239E2107D11465AED14A6ED081E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and due from banks</link:label>
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    <link:label id="lab_bokf_Interestbearingcashandcashequivalents_5DC71D9A403FF30798AFED14A6EE3A68_documentation_en-US" xlink:label="lab_bokf_Interestbearingcashandcashequivalents_5DC71D9A403FF30798AFED14A6EE3A68" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents money market or interest-bearing cash accounts held in other financial institutions (including the Federal Reserve); federal funds sold to other depository institutions, securities brokers or securities dealers and securities purchased under agreements to resell.</link:label>
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    <link:label id="lab_bokf_FairValueOptionSecurities_7A3180EBF66D7B66F863ED14A6EEE43E_terseLabel_en-US" xlink:label="lab_bokf_FairValueOptionSecurities_7A3180EBF66D7B66F863ED14A6EEE43E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value option securities</link:label>
    <link:label id="lab_bokf_FairValueOptionSecurities_7A3180EBF66D7B66F863ED14A6EEE43E_label_en-US" xlink:label="lab_bokf_FairValueOptionSecurities_7A3180EBF66D7B66F863ED14A6EEE43E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair value option securities</link:label>
    <link:label id="lab_bokf_FairValueOptionSecurities_7A3180EBF66D7B66F863ED14A6EEE43E_documentation_en-US" xlink:label="lab_bokf_FairValueOptionSecurities_7A3180EBF66D7B66F863ED14A6EEE43E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair value option securities represent securities the Company has elected to carry at fair value and separately identified on the balance sheet with changes in fair value recognized in earnings as they occur. Certain residential mortgage-backed securities issued by US government agencies are held as an economic hedge of changes in the fair value of mortgage servicing rights and related derivative contracts. In addition, other securities may be held to manage interest rate risk or for deferred compensation purposes. Securities held for interest rate risk management may be economically hedged by derivative contracts not designated as hedging instruments effectively modify these fixed rate securities into variable rate securities.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecurities_26C9658046A468D3374CD8E84276021B" xlink:to="lab_us-gaap_AvailableForSaleSecurities_26C9658046A468D3374CD8E84276021B" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYieldAbstract_B0A9FA1C924319A446A0D8E84276E3E2" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nominal yield of available-for-sale securities maturing in the next rolling twelve months following the balance sheet presented.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsNominalYield_C741DE548631889B7E57D8E842763169" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the nominal yield of available-for-sale securities maturing in the second rolling twelve months through the fifth rolling twelve months following the balance sheet date presented.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveNominalYield_C3D937D138297FEFBE01D8E84276E12A" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the nominal yield of available-for-sale securities maturing in the sixth rolling twelve months through the tenth rolling twelve months following the balance sheet presented</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenNominalYield_8013760ADFE02DD45D6FD8E842762D66" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the nominal yield of available-for-sale securities maturing after tenth rolling twevle months following the balance sheet presented</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenNominalYield_9EA1F001189CF9E1C5D3D8E8427ADB49" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Nominal Yield</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the nominal yield of available-for sale securities as of the balance sheet date.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesNominalYield_C9A0C7AA1762A5085A63D8E8427A8BF5" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8_terseLabel_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Weighted Average Maturity</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8_label_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Weighted Average Maturity</link:label>
    <link:label id="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8_documentation_en-US" xlink:label="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the the contractual weighted average maturity (weighted by amount of the security) for this portion of the available-for-sale securities portfolio.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity" xlink:label="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8" xlink:to="lab_bokf_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturity_D4D443FF2EA3C5332C19D8E8427BAAB8" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378_verboseLabel_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation</link:label>
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378_label_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation</link:label>
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378_documentation_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Effective tax rate for nominal yield calculation for available for sale securities.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation" xlink:label="loc_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378" xlink:to="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesEffectivetaxratefornominalyieldcalculation_7CBE34D52609A95ACB57D8E8427BA378" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475_terseLabel_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities</link:label>
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475_label_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities</link:label>
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475_documentation_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The calculated weighted-average expected life of mortgage-backed securities based on prepayment assumptions as of the balance sheet date.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities" xlink:label="loc_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475" xlink:to="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesAverageExpectedLifeofMortgagebackedSecurities_0D640CF283646EF7C0BAD8E8427B4475" xlink:type="arc" />
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesNumberofdaysforinterestratestoreset_132C6342FF7D6E7C77A8D8E8427B3D79_terseLabel_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesNumberofdaysforinterestratestoreset_132C6342FF7D6E7C77A8D8E8427B3D79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset</link:label>
    <link:label id="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesNumberofdaysforinterestratestoreset_132C6342FF7D6E7C77A8D8E8427B3D79_label_en-US" xlink:label="lab_bokf_AvailableforsaleSecuritiesDebtMaturitiesNumberofdaysforinterestratestoreset_132C6342FF7D6E7C77A8D8E8427B3D79" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset</link:label>
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    <link:label id="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_CD56AD2D1E567E8C226C5A3BCE5F1DE7_totalLabel_en-US" xlink:label="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_FC8D36E8E92F5E86AF048B0EFDE971DA" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_CD56AD2D1E567E8C226C5A3BCE5F1DE7_label_en-US" xlink:label="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_FC8D36E8E92F5E86AF048B0EFDE971DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Assets, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_CD56AD2D1E567E8C226C5A3BCE5F1DE7_documentation_en-US" xlink:label="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_FC8D36E8E92F5E86AF048B0EFDE971DA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net derivative assets before offsetting the obligation to return cash collateral under a master netting or similar arrangement.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_DerivativeAssetsNetFairValueBeforeCashCollateral" xlink:label="loc_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_FC8D36E8E92F5E86AF048B0EFDE971DA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_FC8D36E8E92F5E86AF048B0EFDE971DA" xlink:to="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_FC8D36E8E92F5E86AF048B0EFDE971DA" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_277FE8510F63016F9B5E5A3BCE5FE54A_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_C5C225A5977D5173A8125306BAF692D6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Cash Collateral</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_277FE8510F63016F9B5E5A3BCE5FE54A_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_C5C225A5977D5173A8125306BAF692D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Collateral, Obligation to Return Cash, Offset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_C5C225A5977D5173A8125306BAF692D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_C5C225A5977D5173A8125306BAF692D6" xlink:to="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_C5C225A5977D5173A8125306BAF692D6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssets_2120973BF478CFE76E935A3BCE5FA590_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssets_FDC48B3FE9A25A70A742BBD4034010DA" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derviative contracts, net of cash collateral, Assets, Fair value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_FDC48B3FE9A25A70A742BBD4034010DA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssets_FDC48B3FE9A25A70A742BBD4034010DA" xlink:to="lab_us-gaap_DerivativeAssets_FDC48B3FE9A25A70A742BBD4034010DA" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_A59B058FC2C30B4157A95A3BCE5FE1C0_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_A3CC38ECFFBF50E28626C7E400B20DC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Fair Value, Net [Abstract]</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_A59B058FC2C30B4157A95A3BCE5FE1C0_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_A3CC38ECFFBF50E28626C7E400B20DC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_A3CC38ECFFBF50E28626C7E400B20DC2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_A3CC38ECFFBF50E28626C7E400B20DC2" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_A3CC38ECFFBF50E28626C7E400B20DC2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_29E55012D686EB2F8BDE5A3BCE5F846E_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_8DBD9E0717B55FDDBD47418AF125EDE5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Gross Fair Value</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_29E55012D686EB2F8BDE5A3BCE5F846E_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_8DBD9E0717B55FDDBD47418AF125EDE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Gross Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_8DBD9E0717B55FDDBD47418AF125EDE5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_8DBD9E0717B55FDDBD47418AF125EDE5" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_8DBD9E0717B55FDDBD47418AF125EDE5" xlink:type="arc" />
    <link:label id="lab_bokf_DerivativeLiabilityNettingAdjustments_D1C2945E42CC1545CDF95A3BCE5F661A_negatedTerseLabel_en-US" xlink:label="lab_bokf_DerivativeLiabilityNettingAdjustments_3710A2935FE45A2ABE56862F47C7D5E0" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Netting Adjustments</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNettingAdjustments_D1C2945E42CC1545CDF95A3BCE5F661A_label_en-US" xlink:label="lab_bokf_DerivativeLiabilityNettingAdjustments_3710A2935FE45A2ABE56862F47C7D5E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Netting Adjustments</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNettingAdjustments_D1C2945E42CC1545CDF95A3BCE5F661A_documentation_en-US" xlink:label="lab_bokf_DerivativeLiabilityNettingAdjustments_3710A2935FE45A2ABE56862F47C7D5E0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of gross derivative liability positions offset by gross derivative asset positions due to enforceable master netting or similar arrangements.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_DerivativeLiabilityNettingAdjustments" xlink:label="loc_bokf_DerivativeLiabilityNettingAdjustments_3710A2935FE45A2ABE56862F47C7D5E0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeLiabilityNettingAdjustments_3710A2935FE45A2ABE56862F47C7D5E0" xlink:to="lab_bokf_DerivativeLiabilityNettingAdjustments_3710A2935FE45A2ABE56862F47C7D5E0" xlink:type="arc" />
    <link:label id="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_1AFC8290CBD62496DAD75A3BCE5F9D5E_totalLabel_en-US" xlink:label="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_439DF402D32756349C79B7882BCDF243" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_1AFC8290CBD62496DAD75A3BCE5F9D5E_label_en-US" xlink:label="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_439DF402D32756349C79B7882BCDF243" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_1AFC8290CBD62496DAD75A3BCE5F9D5E_documentation_en-US" xlink:label="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_439DF402D32756349C79B7882BCDF243" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net derivative liability before consideration of right to reclasim cash collateral under master netting or similar arrangements.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral" xlink:label="loc_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_439DF402D32756349C79B7882BCDF243" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_439DF402D32756349C79B7882BCDF243" xlink:to="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_439DF402D32756349C79B7882BCDF243" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_DAA9E158B8C7F6F8F2DC5A3BCE5F5223_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_CD4E6CEFA223592091BBD8C1FCBD72C1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Cash Collateral</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_DAA9E158B8C7F6F8F2DC5A3BCE5F5223_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_CD4E6CEFA223592091BBD8C1FCBD72C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Collateral, Right to Reclaim Cash, Offset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_CD4E6CEFA223592091BBD8C1FCBD72C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_CD4E6CEFA223592091BBD8C1FCBD72C1" xlink:to="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_CD4E6CEFA223592091BBD8C1FCBD72C1" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilities_F1DCF5A47B1F331D26CF5A3BCE5FBE14_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities_BD2F2D0657765EFB8393B3499DD18B8E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Fair Value, Net of Cash Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_BD2F2D0657765EFB8393B3499DD18B8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilities_BD2F2D0657765EFB8393B3499DD18B8E" xlink:to="lab_us-gaap_DerivativeLiabilities_BD2F2D0657765EFB8393B3499DD18B8E" xlink:type="arc" />
    <link:label id="lab_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_B3B21DEB46FF6A6395E6073296DF0FDB_label_en-US" xlink:label="lab_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_530AFF02A49759689C080B1196C00BD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Measured On Recurring Basis, Significant Unobservable Inputs, Quantitative Information [Abstract]</link:label>
    <link:label id="lab_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_B3B21DEB46FF6A6395E6073296DF0FDB_documentation_en-US" xlink:label="lab_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_530AFF02A49759689C080B1196C00BD9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Measured On Recurring Basis, Significant Unobservable Inputs, Quantitative Information [Abstract]</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract" xlink:label="loc_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_530AFF02A49759689C080B1196C00BD9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_530AFF02A49759689C080B1196C00BD9" xlink:to="lab_bokf_FairValueMeasurementsMeasuredOnRecurringBasisSignificantUnobservableInputsQuantitativeInformationAbstract_530AFF02A49759689C080B1196C00BD9" xlink:type="arc" />
    <link:label id="lab_bokf_FairValueInputsAssetParValue_F87B8927CB238B53479D073296E1A855_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetParValue_A30774FA95625AF4ACD730BD78988809" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Par Value</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetParValue_F87B8927CB238B53479D073296E1A855_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetParValue_A30774FA95625AF4ACD730BD78988809" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Par Value</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetParValue_F87B8927CB238B53479D073296E1A855_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetParValue_A30774FA95625AF4ACD730BD78988809" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the par value of financial insturments recorded at fair value on a recurring basis using significant unobservable inputs</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_FairValueInputsAssetParValue" xlink:label="loc_bokf_FairValueInputsAssetParValue_A30774FA95625AF4ACD730BD78988809" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_FairValueInputsAssetParValue_A30774FA95625AF4ACD730BD78988809" xlink:to="lab_bokf_FairValueInputsAssetParValue_A30774FA95625AF4ACD730BD78988809" xlink:type="arc" />
    <link:label id="lab_bokf_FairValueInputsAssetAmortizedCost_B630CEA8911642F5D8B0073296E141C7_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetAmortizedCost_CCCD966B4CC659C8A70793456C8FCDB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Amortized Cost/Unpaid Principal Balance</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetAmortizedCost_B630CEA8911642F5D8B0073296E141C7_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetAmortizedCost_CCCD966B4CC659C8A70793456C8FCDB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Amortized Cost</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetAmortizedCost_B630CEA8911642F5D8B0073296E141C7_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetAmortizedCost_CCCD966B4CC659C8A70793456C8FCDB1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amortized cost of assets measured on a recurring basis using significant unobservable inputs.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_FairValueInputsAssetAmortizedCost" xlink:label="loc_bokf_FairValueInputsAssetAmortizedCost_CCCD966B4CC659C8A70793456C8FCDB1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_FairValueInputsAssetAmortizedCost_CCCD966B4CC659C8A70793456C8FCDB1" xlink:to="lab_bokf_FairValueInputsAssetAmortizedCost_CCCD966B4CC659C8A70793456C8FCDB1" xlink:type="arc" />
    <link:label id="lab_bokf_FairValueInputsAssetFairValue_34B02534BF9FF9FF2EEB073296E12E35_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetFairValue_4CE2A2CF6912583C8A7D19F3745EDCEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Fair Value</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetFairValue_34B02534BF9FF9FF2EEB073296E12E35_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetFairValue_4CE2A2CF6912583C8A7D19F3745EDCEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Fair Value</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetFairValue_34B02534BF9FF9FF2EEB073296E12E35_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetFairValue_4CE2A2CF6912583C8A7D19F3745EDCEF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair value of assets measured at fair value on a recurring basis using significant unobservable inputs.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_FairValueInputsAssetFairValue" xlink:label="loc_bokf_FairValueInputsAssetFairValue_4CE2A2CF6912583C8A7D19F3745EDCEF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_FairValueInputsAssetFairValue_4CE2A2CF6912583C8A7D19F3745EDCEF" xlink:to="lab_bokf_FairValueInputsAssetFairValue_4CE2A2CF6912583C8A7D19F3745EDCEF" xlink:type="arc" />
    <link:label id="lab_bokf_FairValueInputsAssetsDiscountRateMinimum_4662AA7897557B0BCDB6073296E1A23F_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetsDiscountRateMinimum_6D7EFAE295225BC792800A49D7211190" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Assets, Discount Rate, Minimum</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetsDiscountRateMinimum_4662AA7897557B0BCDB6073296E1A23F_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetsDiscountRateMinimum_6D7EFAE295225BC792800A49D7211190" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Assets, Discount Rate, Minimum</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetsDiscountRateMinimum_4662AA7897557B0BCDB6073296E1A23F_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetsDiscountRateMinimum_6D7EFAE295225BC792800A49D7211190" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents discount rate used to develop fair value. Discount rates based on reference to interest rate spreads on comparabale securites of similar duration and credit rating as determined by the nationally recognized rating agencies adjusted for a lack of trading volume.</link:label>
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    <link:label id="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMinimum_AAF34F3969F0649A886D073296E2DAA4_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMinimum_10ED8A14195C5B32939D07A5207C1A4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Minimum</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMinimum_AAF34F3969F0649A886D073296E2DAA4_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMinimum_10ED8A14195C5B32939D07A5207C1A4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Assets, Fair Value As Percentage of Par Value or Principal Balance, Minimum</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMinimum_AAF34F3969F0649A886D073296E2DAA4_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMinimum_10ED8A14195C5B32939D07A5207C1A4A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fair value of asset as a percentage of par value for securities or unpaid principal balance for loan, Minimum</link:label>
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    <link:label id="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_CC6A092CFA6EC75B3717073296E23C7E_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_4EB918A6C88E59A29D13D65A61BEF9EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Assets, Fair Value As Percentage of Par Value, Maximum</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_CC6A092CFA6EC75B3717073296E23C7E_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_4EB918A6C88E59A29D13D65A61BEF9EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Assets, Fair Value As Percentage of Par Value or Principal Balance, Maximum</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_CC6A092CFA6EC75B3717073296E23C7E_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_4EB918A6C88E59A29D13D65A61BEF9EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fair value of asset as a percentage of par value for securities or unpaid principal balance for loan, Maximum</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum" xlink:label="loc_bokf_FairValueInputsAssetsFairValueAsPercentageofParValueorPrincipalBalanceMaximum_4EB918A6C88E59A29D13D65A61BEF9EF" xlink:type="locator" />
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    <link:label id="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_5019A4CA0337A296FD00073296E2086B_terseLabel_en-US" xlink:label="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_2EAF83799CE859A3B8ACFD5C3A2D3B82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Fair Value As Percentage of Par Value, Weighted Average</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_5019A4CA0337A296FD00073296E2086B_label_en-US" xlink:label="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_2EAF83799CE859A3B8ACFD5C3A2D3B82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Asset, Fair Value As Percentage of Par Value or Unpaid Principal Balance, Weighted Average</link:label>
    <link:label id="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_5019A4CA0337A296FD00073296E2086B_documentation_en-US" xlink:label="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_2EAF83799CE859A3B8ACFD5C3A2D3B82" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fair value of asset as a percentage of par value for securities or unpaid principal balance for loan, weighted average.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage" xlink:label="loc_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_2EAF83799CE859A3B8ACFD5C3A2D3B82" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_2EAF83799CE859A3B8ACFD5C3A2D3B82" xlink:to="lab_bokf_FairValueInputsAssetFairValueAsPercentageofParValueorUnpaidPrincipalBalanceWeightedAverage_2EAF83799CE859A3B8ACFD5C3A2D3B82" xlink:type="arc" />
    <link:label id="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_37210A75407E03F0B151073296E2C525_terseLabel_en-US" xlink:label="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_39F4C3C7C3895AD5998DF75A2CE228D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies</link:label>
    <link:label id="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_37210A75407E03F0B151073296E2C525_label_en-US" xlink:label="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_39F4C3C7C3895AD5998DF75A2CE228D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies</link:label>
    <link:label id="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_37210A75407E03F0B151073296E2C525_documentation_en-US" xlink:label="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_39F4C3C7C3895AD5998DF75A2CE228D9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents a liquidity discount applied to the market value of mortgage loans qualifying for sale to U.S. government agencies when a mortgage loan is ineligible for sale to U.S. government agencies.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies" xlink:label="loc_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_39F4C3C7C3895AD5998DF75A2CE228D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_39F4C3C7C3895AD5998DF75A2CE228D9" xlink:to="lab_bokf_LiquidityDiscountonMortgageLoansQualifyingforSaletoUSGovtAgencies_39F4C3C7C3895AD5998DF75A2CE228D9" xlink:type="arc" />
    <link:label id="lab_bokf_InvestmentGradeTaxExemptSecuritiesYieldSpreadOverComparableSecuritiesMinimum_99C6EB51DB98AAD01D4E073296E2DDC0_terseLabel_en-US" xlink:label="lab_bokf_InvestmentGradeTaxExemptSecuritiesYieldSpreadOverComparableSecuritiesMinimum_1FC12551612754FD90D3AA69B84CA869" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum</link:label>
    <link:label id="lab_bokf_InvestmentGradeTaxExemptSecuritiesYieldSpreadOverComparableSecuritiesMinimum_99C6EB51DB98AAD01D4E073296E2DDC0_label_en-US" xlink:label="lab_bokf_InvestmentGradeTaxExemptSecuritiesYieldSpreadOverComparableSecuritiesMinimum_1FC12551612754FD90D3AA69B84CA869" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Grade Tax Exempt Securities Yield Spread Over Comparable Securities Minimum</link:label>
    <link:label id="lab_bokf_InvestmentGradeTaxExemptSecuritiesYieldSpreadOverComparableSecuritiesMinimum_99C6EB51DB98AAD01D4E073296E2DDC0_documentation_en-US" xlink:label="lab_bokf_InvestmentGradeTaxExemptSecuritiesYieldSpreadOverComparableSecuritiesMinimum_1FC12551612754FD90D3AA69B84CA869" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The minimum yield spread of tax-exempt investment grade securities over comparable tax-exempt securities expressed as basis points.</link:label>
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    <link:label id="lab_bokf_AverageYieldsOnComparableShortTermTaxableSecuritiesMaximum_C3A7E64D7DB1AF4CA29D073296E2380C_documentation_en-US" xlink:label="lab_bokf_AverageYieldsOnComparableShortTermTaxableSecuritiesMaximum_B7A7652D177C5EFC8185B5CB00716871" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The average rate of yield for comparable short-term investment grade taxable security.</link:label>
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    <link:label id="lab_us-gaap_AssetsAbstract_311951E6BDA159047E5AED14A72990CF_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_311951E6BDA159047E5AED14A72990CF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Assets: [Abstract]</link:label>
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    <link:label id="lab_us-gaap_MortgagesHeldForSaleFairValueDisclosure_677AAB506D9C8495ED9DED14A72ABC11_terseLabel_en-US" xlink:label="lab_us-gaap_MortgagesHeldForSaleFairValueDisclosure_677AAB506D9C8495ED9DED14A72ABC11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale</link:label>
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    <link:label id="lab_bokf_MortgageBankingRevenueAbstract_0E4E6ED6C66485509E8CA53FD90FEFAA_label_en-US" xlink:label="lab_bokf_MortgageBankingRevenueAbstract_ED8FB4E4273855F58961C4BA68854260" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Banking Revenue [Abstract]</link:label>
    <link:label id="lab_bokf_MortgageBankingRevenueAbstract_0E4E6ED6C66485509E8CA53FD90FEFAA_documentation_en-US" xlink:label="lab_bokf_MortgageBankingRevenueAbstract_ED8FB4E4273855F58961C4BA68854260" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mortgage Banking Revenue [Abstract]</link:label>
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    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_89C0E0C5A72FEFB29962A53FD90F56EE_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans_CDA8A74EB27950DCBCF9D9AD23045C31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net realized gains on sale of mortgage loans</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_89C0E0C5A72FEFB29962A53FD90F56EE_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans_CDA8A74EB27950DCBCF9D9AD23045C31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Sale of Mortgage Loans</link:label>
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    <link:label id="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_0933B909299623C9A9B3A53FD90FBBD1_terseLabel_en-US" xlink:label="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_F13DA6CAC95C5AFBA64ED3BCE1AC56C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in unrealized gain on mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_0933B909299623C9A9B3A53FD90FBBD1_label_en-US" xlink:label="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_F13DA6CAC95C5AFBA64ED3BCE1AC56C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net change in unrealized gain on mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_0933B909299623C9A9B3A53FD90FBBD1_documentation_en-US" xlink:label="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_F13DA6CAC95C5AFBA64ED3BCE1AC56C1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the net change in unrealized gain on mortgage loans held for sale under fair value option.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_Netchangeinunrealizedgainonmortgageloansheldforsale" xlink:label="loc_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_F13DA6CAC95C5AFBA64ED3BCE1AC56C1" xlink:type="locator" />
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    <link:label id="lab_bokf_Changeinfairvalueofmortgageloancommitments_5475FB479FEDA7251B7FA53FD90FA099_terseLabel_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageloancommitments_06B10575343D582A8E08621CE9150B15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in the fair value of mortgage loan commitments</link:label>
    <link:label id="lab_bokf_Changeinfairvalueofmortgageloancommitments_5475FB479FEDA7251B7FA53FD90FA099_label_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageloancommitments_06B10575343D582A8E08621CE9150B15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage loan commitments</link:label>
    <link:label id="lab_bokf_Changeinfairvalueofmortgageloancommitments_5475FB479FEDA7251B7FA53FD90FA099_documentation_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageloancommitments_06B10575343D582A8E08621CE9150B15" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the change in fair value of mortgage loan commitments during the period.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_Changeinfairvalueofmortgageloancommitments" xlink:label="loc_bokf_Changeinfairvalueofmortgageloancommitments_06B10575343D582A8E08621CE9150B15" xlink:type="locator" />
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    <link:label id="lab_bokf_Changeinthefairvalueofforwardsalescommitments_D229DBC97F9CD630CE36A53FD90F279B_terseLabel_en-US" xlink:label="lab_bokf_Changeinthefairvalueofforwardsalescommitments_353AA1FDBC6554BCB3E0918C437D85E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in the fair value of forward sales contracts</link:label>
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    <link:label id="lab_bokf_Changeinthefairvalueofforwardsalescommitments_D229DBC97F9CD630CE36A53FD90F279B_documentation_en-US" xlink:label="lab_bokf_Changeinthefairvalueofforwardsalescommitments_353AA1FDBC6554BCB3E0918C437D85E1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the change in the fair value of forward sales commitments considered to be derivative instruments during the period.</link:label>
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    <link:label id="lab_bokf_MortgageProductionRevenue_B1A33B5B415A9FDCD32AA53FD90F6A39_totalLabel_en-US" xlink:label="lab_bokf_MortgageProductionRevenue_85CFDD483CF75F36ACF05F2B6DEE1F1A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total production revenue</link:label>
    <link:label id="lab_bokf_MortgageProductionRevenue_B1A33B5B415A9FDCD32AA53FD90F6A39_label_en-US" xlink:label="lab_bokf_MortgageProductionRevenue_85CFDD483CF75F36ACF05F2B6DEE1F1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Production Revenue</link:label>
    <link:label id="lab_bokf_MortgageProductionRevenue_B1A33B5B415A9FDCD32AA53FD90F6A39_documentation_en-US" xlink:label="lab_bokf_MortgageProductionRevenue_85CFDD483CF75F36ACF05F2B6DEE1F1A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total gain (loss) on mortgage loans held for sale, including mortgage loan commitments and forward sales contracts.</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MortgageProductionRevenue" xlink:label="loc_bokf_MortgageProductionRevenue_85CFDD483CF75F36ACF05F2B6DEE1F1A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ServicingFeesNet_26A4E2AE83EFE9BCBA14A53FD90F05E4_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingFeesNet_820DA71CB7E75D6091785A996384B2E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing revenue</link:label>
    <link:label id="lab_us-gaap_ServicingFeesNet_26A4E2AE83EFE9BCBA14A53FD90F05E4_label_en-US" xlink:label="lab_us-gaap_ServicingFeesNet_820DA71CB7E75D6091785A996384B2E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank Servicing Fees</link:label>
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    <link:label id="lab_bokf_MortgageBankingRevenue_DA1CFEDC237F062D6549A53FD90FC326_totalLabel_en-US" xlink:label="lab_bokf_MortgageBankingRevenue_D0F84166F39153B292617E8C30F0A105" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total mortgage banking revenue</link:label>
    <link:loc xlink:href="bokf-20180630.xsd#bokf_MortgageBankingRevenue" xlink:label="loc_bokf_MortgageBankingRevenue_D0F84166F39153B292617E8C30F0A105" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_CDF1063F7E54B97E02BDEB8FBB99CE51" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_DCD79075D1A6AF6BBAB4EB8FBB99868B_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_DCD79075D1A6AF6BBAB4EB8FBB99868B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_DD0D08F173B41601B3C1EB8FBB99160E_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_DD0D08F173B41601B3C1EB8FBB99160E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DD0D08F173B41601B3C1EB8FBB99160E" xlink:type="locator" />
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    <link:label id="lab_bokf_CobizFinancialInc.Member_17AF9C8684DF7192FBFAEB8FBB999C8F_terseLabel_en-US" xlink:label="lab_bokf_CobizFinancialInc.Member_17AF9C8684DF7192FBFAEB8FBB999C8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cobiz Financial Inc. [Member]</link:label>
    <link:label id="lab_bokf_CobizFinancialInc.Member_17AF9C8684DF7192FBFAEB8FBB999C8F_label_en-US" xlink:label="lab_bokf_CobizFinancialInc.Member_17AF9C8684DF7192FBFAEB8FBB999C8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cobiz Financial Inc. [Member]</link:label>
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