XML 66 R56.htm IDEA: XBRL DOCUMENT v3.21.2

Fair Value Measurements Fair Value Measurement, Measured On Non-Recurring Basis, Signfiicant Unobservable Inputs, Quantitative Information (Details) - Fair Value, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands

Jun. 30, 2021

Jun. 30, 2020

Nonaccruing Loans [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Assets, Fair Value Disclosure

$ 42,453

$ 32,448

Real estate and other repossessed assets [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Assets, Fair Value Disclosure

36,010

400

Discounted Cash Flow [Member] | Nonaccruing Loans [Member] | Management knowledge of Industry [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Assets, Fair Value Disclosure

42,453

32,448

Discounted Cash Flow [Member] | Real estate and other repossessed assets [Member] | Management knowledge of Industry [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Assets, Fair Value Disclosure

$ 36,010

Appraised Value, as Adjusted [Member] | Real estate and other repossessed assets [Member] | Marketability adjustments off appraised value

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Assets, Fair Value Disclosure

$ 400

Minimum [Member] | Nonaccruing Loans [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance

4.00%

^[1]

0.00%

^[2]

Minimum [Member] | Real estate and other repossessed assets [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Fair Value Measurement, Percentage of Appraised Value.

87.00%

Maximum [Member] | Nonaccruing Loans [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance

96.00%

^[1]

83.00%

^[2]

Maximum [Member] | Real estate and other repossessed assets [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Fair Value Measurement, Percentage of Appraised Value.

87.00%

Weighted Average [Member] | Nonaccruing Loans [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance

47.00%

^[1]

35.00%

^[2]

Weighted Average [Member] | Real estate and other repossessed assets [Member]

Fair Value Measurement Inputs and Valuation Techniques [Line Items]

Fair Value Measurement, Percentage of Appraised Value.

87.00%

[1]	Represents fair value as a percentage of the unpaid principal balance.
[2]	Represents fair value as a percentage of the unpaid principal balance.

X

- Definition

Fair Value Measurement, Percentage of appraised value

+ References

No definition available.

+ Details

Name:	bokf_FairValueMeasurementPercentageofappraisedvalue
Namespace Prefix:	bokf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair Value of Impaired Loans as Percentage of Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	bokf_FairValueofImpairedLoansasPercentageofUnpaidPrincipalBalance
Namespace Prefix:	bokf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=bokf_FairValueNonaccruingLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=bokf_FairValueRealEstateAndOtherRepossessedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_ValuationTechniqueDiscountedCashFlowMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=bokf_ManagementknowledgeofIndustryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=bokf_ValuationTechniqueAppraisedValueasAdjustedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=bokf_MarketabilityadjustmentsoffappraisedvalueDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: