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    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3555B863A8ED052743624FDA64D74F42_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_7532C9FE14F0587882E04126B3C59C50" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Axis]</link:label>
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    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_04BBDA9FCA468A1952224FDA64D878A9_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_28F7CF8438765D76917FD6E92A7590D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Domain]</link:label>
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    <link:label id="lab_us-gaap_CommercialPortfolioSegmentMember_273BDC2D43357889719A4FDA64D80548_verboseLabel_en-US" xlink:label="lab_us-gaap_CommercialPortfolioSegmentMember_737D5B0D9B9C54599F1E17335E13AA8C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total commercial [Member]</link:label>
    <link:label id="lab_us-gaap_CommercialPortfolioSegmentMember_273BDC2D43357889719A4FDA64D80548_label_en-US" xlink:label="lab_us-gaap_CommercialPortfolioSegmentMember_737D5B0D9B9C54599F1E17335E13AA8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_737D5B0D9B9C54599F1E17335E13AA8C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_9F9CCDE70FB3C7CEDA2A4FDA64D8259A_verboseLabel_en-US" xlink:label="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_ADE0F19A7135532696075FC750967A56" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Commercial real estate [Member]</link:label>
    <link:label id="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_9F9CCDE70FB3C7CEDA2A4FDA64D8259A_label_en-US" xlink:label="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_ADE0F19A7135532696075FC750967A56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Real Estate Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_ADE0F19A7135532696075FC750967A56" xlink:type="locator" />
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    <link:label id="lab_isba_CommercialOtherPortfolioSegmentMember_9C90443E016B8AC222234FDA64D8523E_verboseLabel_en-US" xlink:label="lab_isba_CommercialOtherPortfolioSegmentMember_E2387D965C315AE28976525077882871" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Commercial other [Member]</link:label>
    <link:label id="lab_isba_CommercialOtherPortfolioSegmentMember_9C90443E016B8AC222234FDA64D8523E_label_en-US" xlink:label="lab_isba_CommercialOtherPortfolioSegmentMember_E2387D965C315AE28976525077882871" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Other Portfolio Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialOtherPortfolioSegmentMember_9C90443E016B8AC222234FDA64D8523E_documentation_en-US" xlink:label="lab_isba_CommercialOtherPortfolioSegmentMember_E2387D965C315AE28976525077882871" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commercial Other Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_CommercialOtherPortfolioSegmentMember" xlink:label="loc_isba_CommercialOtherPortfolioSegmentMember_E2387D965C315AE28976525077882871" xlink:type="locator" />
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    <link:label id="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_1C2B09B0EE20F0FC7C6B4FDA64D98970_terseLabel_en-US" xlink:label="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_80E05070411F53299D975AA1DB255867" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial Advances to Mortgage Brokers Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_1C2B09B0EE20F0FC7C6B4FDA64D98970_label_en-US" xlink:label="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_80E05070411F53299D975AA1DB255867" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Advances to Mortgage Brokers Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_1C2B09B0EE20F0FC7C6B4FDA64D98970_documentation_en-US" xlink:label="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_80E05070411F53299D975AA1DB255867" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commercial Advances to Mortgage Brokers Segment [Member]</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:label="loc_isba_CommercialAdvancestoMortgageBrokersSegmentMember_80E05070411F53299D975AA1DB255867" xlink:type="locator" />
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    <link:label id="lab_isba_AgriculturalPortfolioSegmentMember_19525F23FDC86FEF07164FDA64D92EFC_verboseLabel_en-US" xlink:label="lab_isba_AgriculturalPortfolioSegmentMember_60A8D14CDB875748BCA64302DFDC2B3D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total agricultural [Member]</link:label>
    <link:label id="lab_isba_AgriculturalPortfolioSegmentMember_19525F23FDC86FEF07164FDA64D92EFC_label_en-US" xlink:label="lab_isba_AgriculturalPortfolioSegmentMember_60A8D14CDB875748BCA64302DFDC2B3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agricultural Portfolio Segment [Member]</link:label>
    <link:label id="lab_isba_AgriculturalPortfolioSegmentMember_19525F23FDC86FEF07164FDA64D92EFC_documentation_en-US" xlink:label="lab_isba_AgriculturalPortfolioSegmentMember_60A8D14CDB875748BCA64302DFDC2B3D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Agricultural portfolio segment.</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_AgriculturalPortfolioSegmentMember" xlink:label="loc_isba_AgriculturalPortfolioSegmentMember_60A8D14CDB875748BCA64302DFDC2B3D" xlink:type="locator" />
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    <link:label id="lab_isba_AgriculturalRealEstatePortfolioSegmentMember_EF3561B3A5DBA7592D454FDA64D9C420_verboseLabel_en-US" xlink:label="lab_isba_AgriculturalRealEstatePortfolioSegmentMember_ADB16475207850EC940C9AF7FEC4DACD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Agricultural real estate [Member]</link:label>
    <link:label id="lab_isba_AgriculturalRealEstatePortfolioSegmentMember_EF3561B3A5DBA7592D454FDA64D9C420_label_en-US" xlink:label="lab_isba_AgriculturalRealEstatePortfolioSegmentMember_ADB16475207850EC940C9AF7FEC4DACD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agricultural Real Estate Portfolio Segment [Member]</link:label>
    <link:label id="lab_isba_AgriculturalRealEstatePortfolioSegmentMember_EF3561B3A5DBA7592D454FDA64D9C420_documentation_en-US" xlink:label="lab_isba_AgriculturalRealEstatePortfolioSegmentMember_ADB16475207850EC940C9AF7FEC4DACD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Agricultural Real Estate Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_AgriculturalRealEstatePortfolioSegmentMember" xlink:label="loc_isba_AgriculturalRealEstatePortfolioSegmentMember_ADB16475207850EC940C9AF7FEC4DACD" xlink:type="locator" />
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    <link:label id="lab_isba_AgriculturalOtherPortfolioSegmentMember_5B32D1715841EE3B032C4FDA64D9EDAA_verboseLabel_en-US" xlink:label="lab_isba_AgriculturalOtherPortfolioSegmentMember_58724A4332B95EEFB1AD458A6DD85825" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Agricultural other [Member]</link:label>
    <link:label id="lab_isba_AgriculturalOtherPortfolioSegmentMember_5B32D1715841EE3B032C4FDA64D9EDAA_label_en-US" xlink:label="lab_isba_AgriculturalOtherPortfolioSegmentMember_58724A4332B95EEFB1AD458A6DD85825" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agricultural Other Portfolio Segment [Member]</link:label>
    <link:label id="lab_isba_AgriculturalOtherPortfolioSegmentMember_5B32D1715841EE3B032C4FDA64D9EDAA_documentation_en-US" xlink:label="lab_isba_AgriculturalOtherPortfolioSegmentMember_58724A4332B95EEFB1AD458A6DD85825" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Agricultural Other Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_AgriculturalOtherPortfolioSegmentMember" xlink:label="loc_isba_AgriculturalOtherPortfolioSegmentMember_58724A4332B95EEFB1AD458A6DD85825" xlink:type="locator" />
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    <link:label id="lab_isba_CommercialAndAgriculturalPortfolioSegmentMember_B5FA7CD968F89946DB3D4FDA64D94C5F_terseLabel_en-US" xlink:label="lab_isba_CommercialAndAgriculturalPortfolioSegmentMember_3236A6F49FF55DC482BD7B125434F77E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial And Agricultural Portfolio Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialAndAgriculturalPortfolioSegmentMember_B5FA7CD968F89946DB3D4FDA64D94C5F_label_en-US" xlink:label="lab_isba_CommercialAndAgriculturalPortfolioSegmentMember_3236A6F49FF55DC482BD7B125434F77E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial And Agricultural Portfolio Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialAndAgriculturalPortfolioSegmentMember_B5FA7CD968F89946DB3D4FDA64D94C5F_documentation_en-US" xlink:label="lab_isba_CommercialAndAgriculturalPortfolioSegmentMember_3236A6F49FF55DC482BD7B125434F77E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commercial And Agricultural Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_CommercialAndAgriculturalPortfolioSegmentMember" xlink:label="loc_isba_CommercialAndAgriculturalPortfolioSegmentMember_3236A6F49FF55DC482BD7B125434F77E" xlink:type="locator" />
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    <link:label id="lab_isba_FinancingReceivableLoanToValueRatioMaximum_CF6E58F340F384244D9E6F16D2587C74_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableLoanToValueRatioMaximum_3D3AFD96C9E85E53951CA52354CBC691" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum percentage of loan</link:label>
    <link:label id="lab_isba_FinancingReceivableLoanToValueRatioMaximum_CF6E58F340F384244D9E6F16D2587C74_label_en-US" xlink:label="lab_isba_FinancingReceivableLoanToValueRatioMaximum_3D3AFD96C9E85E53951CA52354CBC691" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Loan To Value Ratio, Maximum</link:label>
    <link:label id="lab_isba_FinancingReceivableLoanToValueRatioMaximum_CF6E58F340F384244D9E6F16D2587C74_documentation_en-US" xlink:label="lab_isba_FinancingReceivableLoanToValueRatioMaximum_3D3AFD96C9E85E53951CA52354CBC691" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Loan To Value Ratio, Maximum</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivableLoanToValueRatioMaximum" xlink:label="loc_isba_FinancingReceivableLoanToValueRatioMaximum_3D3AFD96C9E85E53951CA52354CBC691" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_FinancingReceivableLoanToValueRatioMaximum_3D3AFD96C9E85E53951CA52354CBC691" xlink:to="lab_isba_FinancingReceivableLoanToValueRatioMaximum_3D3AFD96C9E85E53951CA52354CBC691" xlink:type="arc" />
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_30BAA1D235D6F489382C6F16D2580031_terseLabel_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_46D6030CB44E5887825D41A49FEEAE03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan advance maturity period</link:label>
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_30BAA1D235D6F489382C6F16D2580031_label_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_46D6030CB44E5887825D41A49FEEAE03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maturity Period</link:label>
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_30BAA1D235D6F489382C6F16D2580031_documentation_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_46D6030CB44E5887825D41A49FEEAE03" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maturity Period</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod" xlink:label="loc_isba_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaturityPeriod_46D6030CB44E5887825D41A49FEEAE03" xlink:type="locator" />
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    <link:label id="lab_isba_FinancingReceivableTerm_38AB48A8DD7D44A515C16F16D258D1A7_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableTerm_C84D7F9847A550E4893EE0E61DE782E1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Financing receivable, amortization term</link:label>
    <link:label id="lab_isba_FinancingReceivableTerm_38AB48A8DD7D44A515C16F16D258D1A7_label_en-US" xlink:label="lab_isba_FinancingReceivableTerm_C84D7F9847A550E4893EE0E61DE782E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Term</link:label>
    <link:label id="lab_isba_FinancingReceivableTerm_38AB48A8DD7D44A515C16F16D258D1A7_documentation_en-US" xlink:label="lab_isba_FinancingReceivableTerm_C84D7F9847A550E4893EE0E61DE782E1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Term</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivableTerm" xlink:label="loc_isba_FinancingReceivableTerm_C84D7F9847A550E4893EE0E61DE782E1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_FinancingReceivableTerm_C84D7F9847A550E4893EE0E61DE782E1" xlink:to="lab_isba_FinancingReceivableTerm_C84D7F9847A550E4893EE0E61DE782E1" xlink:type="arc" />
    <link:label id="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_DF773556ED16EAB3184B6F16D25880BA_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_A2D5534A250E5AC38B63A13B6E198CE6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum percentage of principal, interest, taxes and hazard insurance on property over gross income</link:label>
    <link:label id="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_DF773556ED16EAB3184B6F16D25880BA_label_en-US" xlink:label="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_A2D5534A250E5AC38B63A13B6E198CE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Payment Amount To Gross Income Ratio, Maximum</link:label>
    <link:label id="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_DF773556ED16EAB3184B6F16D25880BA_documentation_en-US" xlink:label="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_A2D5534A250E5AC38B63A13B6E198CE6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Payment Amount To Gross Income Ratio, Maximum</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum" xlink:label="loc_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_A2D5534A250E5AC38B63A13B6E198CE6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_A2D5534A250E5AC38B63A13B6E198CE6" xlink:to="lab_isba_FinancingReceivablePaymentAmountToGrossIncomeRatioMaximum_A2D5534A250E5AC38B63A13B6E198CE6" xlink:type="arc" />
    <link:label id="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_CB228A58C949124E21B06F16D2594179_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_0CA3483BAC9E530B87442AE0F4373F5E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum percentage of debt servicing over gross income</link:label>
    <link:label id="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_CB228A58C949124E21B06F16D2594179_label_en-US" xlink:label="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_0CA3483BAC9E530B87442AE0F4373F5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Debt Servicing To Gross Income Ratio, Maximum</link:label>
    <link:label id="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_CB228A58C949124E21B06F16D2594179_documentation_en-US" xlink:label="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_0CA3483BAC9E530B87442AE0F4373F5E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Debt Servicing To Gross Income Ratio, Maximum</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum" xlink:label="loc_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_0CA3483BAC9E530B87442AE0F4373F5E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_0CA3483BAC9E530B87442AE0F4373F5E" xlink:to="lab_isba_FinancingReceivableDebtServicingToGrossIncomeRatioMaximum_0CA3483BAC9E530B87442AE0F4373F5E" xlink:type="arc" />
    <link:label id="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_AF7CBE8AEF78CE0AB5446F16D25972FC_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_4342F50D70C35D6098354411B7A28082" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Maximum amount without corporation approval</link:label>
    <link:label id="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_AF7CBE8AEF78CE0AB5446F16D25972FC_label_en-US" xlink:label="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_4342F50D70C35D6098354411B7A28082" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Amount, Additional Approval Threshold</link:label>
    <link:label id="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_AF7CBE8AEF78CE0AB5446F16D25972FC_documentation_en-US" xlink:label="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_4342F50D70C35D6098354411B7A28082" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Amount, Additional Approval Threshold</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivableAmountAdditionalApprovalThreshold" xlink:label="loc_isba_FinancingReceivableAmountAdditionalApprovalThreshold_4342F50D70C35D6098354411B7A28082" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_FinancingReceivableAmountAdditionalApprovalThreshold_4342F50D70C35D6098354411B7A28082" xlink:to="lab_isba_FinancingReceivableAmountAdditionalApprovalThreshold_4342F50D70C35D6098354411B7A28082" xlink:type="arc" />
    <link:label id="lab_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_08DBBB431A25AB9407656F16D2596259_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_F6B54F8335235EAA8EA582E4F7C856EE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Migration analysis of loan portfolio period</link:label>
    <link:label id="lab_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_08DBBB431A25AB9407656F16D2596259_label_en-US" xlink:label="lab_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_F6B54F8335235EAA8EA582E4F7C856EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance For Credit Losses, Historical Loss Allocation Analysis Period</link:label>
    <link:label id="lab_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_08DBBB431A25AB9407656F16D2596259_documentation_en-US" xlink:label="lab_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_F6B54F8335235EAA8EA582E4F7C856EE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance For Credit Losses, Historical Loss Allocation Analysis Period</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod" xlink:label="loc_isba_FinancingReceivableAllowanceForCreditLossesHistoricalLossAllocationAnalysisPeriod_F6B54F8335235EAA8EA582E4F7C856EE" xlink:type="locator" />
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    <link:label id="lab_isba_FinancingReceivableCreditQualityDelinquencyPeriod_16B2E10E9FF5FDF455756F16D25977D9_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableCreditQualityDelinquencyPeriod_1B56FD67D6B55A3688558C14BE16DA73" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Delinquency period</link:label>
    <link:label id="lab_isba_FinancingReceivableCreditQualityDelinquencyPeriod_16B2E10E9FF5FDF455756F16D25977D9_label_en-US" xlink:label="lab_isba_FinancingReceivableCreditQualityDelinquencyPeriod_1B56FD67D6B55A3688558C14BE16DA73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Credit Quality, Delinquency Period</link:label>
    <link:label id="lab_isba_FinancingReceivableCreditQualityDelinquencyPeriod_16B2E10E9FF5FDF455756F16D25977D9_documentation_en-US" xlink:label="lab_isba_FinancingReceivableCreditQualityDelinquencyPeriod_1B56FD67D6B55A3688558C14BE16DA73" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing Receivable, Credit Quality, Delinquency Period</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_FinancingReceivableCreditQualityDelinquencyPeriod" xlink:label="loc_isba_FinancingReceivableCreditQualityDelinquencyPeriod_1B56FD67D6B55A3688558C14BE16DA73" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_2DA06F34F083848B84A36F16D2593D14_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_84171F0917075C4C8DC46435ABAD5EF2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Advance in connection with impaired loans</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_2DA06F34F083848B84A36F16D2593D14_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_84171F0917075C4C8DC46435ABAD5EF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Leases Receivable, Impaired, Commitment to Lend</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend" xlink:label="loc_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_84171F0917075C4C8DC46435ABAD5EF2" xlink:type="locator" />
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    <link:label id="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_FE768E5BF3545B9E751B6F16D25A966F_terseLabel_en-US" xlink:label="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_C10CD23F2FDB5A39A3BC176D892CDACE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of loans restructured through the forbearance of principal or accrued interest</link:label>
    <link:label id="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_FE768E5BF3545B9E751B6F16D25A966F_label_en-US" xlink:label="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_C10CD23F2FDB5A39A3BC176D892CDACE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructure of Loans through Forbearance of Principal or Accrued Interest</link:label>
    <link:label id="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_FE768E5BF3545B9E751B6F16D25A966F_documentation_en-US" xlink:label="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_C10CD23F2FDB5A39A3BC176D892CDACE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Restructure of loans through the forbearance of principal or accrued interest.</link:label>
    <link:loc xlink:href="isba-20200331.xsd#isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:label="loc_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_C10CD23F2FDB5A39A3BC176D892CDACE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_95494A5B67E1437502606F16D25DE893_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_CF80EDC1A42A50D3AB62751C820CE98C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans in default</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_95494A5B67E1437502606F16D25DE893_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_CF80EDC1A42A50D3AB62751C820CE98C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Modifications, Subsequent Default, Number of Contracts</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1" xlink:label="loc_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_CF80EDC1A42A50D3AB62751C820CE98C" xlink:type="locator" />
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