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    <link:label id="lab_us-gaap_FinancingReceivableModificationsRecordedInvestment_df08f1bb-0717-4a1a-a048-8786aacbab5b_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableModificationsRecordedInvestment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Troubled debt restructurings</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment_8fbc2541-0f91-4ddd-9c35-9f2fca254159_totalLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired loans, Outstanding Balance</link:label>
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_c3a065b5-8a2d-467e-9183-9812bf47b48a_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans and Leases Receivable, Net Amount [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_0173751d-302a-40d4-b639-81fa0cdef394_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from issuance of common stock</link:label>
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    <link:label id="lab_us-gaap_Revenues_8e89eecf-33fa-41d3-bd86-0dd323f67e00_totalLabel_en-US" xlink:label="lab_us-gaap_Revenues" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total income</link:label>
    <link:label id="lab_us-gaap_Revenues_label_en-US" xlink:label="lab_us-gaap_Revenues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenues</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues" xlink:to="lab_us-gaap_Revenues" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a413495b-ea66-4655-a02d-865a6ab9ffe0_totalLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average number of common shares outstanding used to calculate diluted earnings per common share</link:label>
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableAllowanceForLoanLossesPolicy_d24ad676-726c-43b2-96f0-b76ae678b09a_terseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableAllowanceForLoanLossesPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allowance for Loan Losses</link:label>
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    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAbstract_819c9d8c-8737-4ad0-a06a-2bab0e72fb4b_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AFS Securities</link:label>
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    <link:label id="lab_isba_LoansReceivableCollateralizedByRealEstateMember_documentation_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByRealEstateMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Real Estate [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_LoansReceivableCollateralizedByRealEstateMember" xlink:to="lab_isba_LoansReceivableCollateralizedByRealEstateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_a7cd9b32-883a-46a7-b5c9-f9be5fd16fb1_verboseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basis of Presentation</link:label>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember_bb86cd8b-c1c5-4790-ad02-a05d5e67ff88_verboseLabel_en-US" xlink:label="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Below Market Interest Rate and Extension of Amortization Period [Member]</link:label>
    <link:label id="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember_label_en-US" xlink:label="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Below Market Interest Rate and Extension of Amortization Period [Member]</link:label>
    <link:label id="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember_documentation_en-US" xlink:label="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Below market interest rate and extension of amortization period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember" xlink:href="isba-20210331.xsd#isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember" xlink:to="lab_isba_BelowMarketInterestRateAndExtensionOfAmortizationPeriodMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubstandardMember_4eb362ec-7a18-4ba5-95d3-b574ac4058df_verboseLabel_en-US" xlink:label="lab_us-gaap_SubstandardMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">6 - Substandard [Member]</link:label>
    <link:label id="lab_us-gaap_SubstandardMember_label_en-US" xlink:label="lab_us-gaap_SubstandardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Substandard [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubstandardMember" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubstandardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubstandardMember" xlink:to="lab_us-gaap_SubstandardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9386db3a-ee0b-43e6-8d5a-dfd72655940b_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Assets (Liabilities), at Fair Value, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:to="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_HighSatisfactoryRatingMember_a5523a4a-9d4b-4d7f-ac62-98e80d5a140a_verboseLabel_en-US" xlink:label="lab_isba_HighSatisfactoryRatingMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">3 - High satisfactory [Member]</link:label>
    <link:label id="lab_isba_HighSatisfactoryRatingMember_label_en-US" xlink:label="lab_isba_HighSatisfactoryRatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">High Satisfactory Rating [Member]</link:label>
    <link:label id="lab_isba_HighSatisfactoryRatingMember_documentation_en-US" xlink:label="lab_isba_HighSatisfactoryRatingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">High satisfactory rating.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_HighSatisfactoryRatingMember" xlink:href="isba-20210331.xsd#isba_HighSatisfactoryRatingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_HighSatisfactoryRatingMember" xlink:to="lab_isba_HighSatisfactoryRatingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_ca284f66-1d69-4495-bd91-74f28bdc3802_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allowance for loan losses, Recoveries</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Allowance for Credit Loss, Recovery</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:to="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Cash_adab80f9-527a-4d18-ac7c-c4b383ffd57c_verboseLabel_en-US" xlink:label="lab_us-gaap_Cash" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash on deposit at subsidiary Bank</link:label>
    <link:label id="lab_us-gaap_Cash_label_en-US" xlink:label="lab_us-gaap_Cash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Cash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Cash" xlink:to="lab_us-gaap_Cash" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinancingReceivableModificationsNumberOfContracts2_da3792f7-0153-4bad-ac88-e24e722a3170_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableModificationsNumberOfContracts2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Loans</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableModificationsNumberOfContracts2_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableModificationsNumberOfContracts2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Modifications, Number of Contracts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsNumberOfContracts2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableModificationsNumberOfContracts2"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableModificationsNumberOfContracts2" xlink:to="lab_us-gaap_FinancingReceivableModificationsNumberOfContracts2" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_CondensedCashFlowStatementsCaptionsLineItems_bf6b3c92-e472-485c-b611-ea019a910999_terseLabel_en-US" xlink:label="lab_srt_CondensedCashFlowStatementsCaptionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Condensed Cash Flow Statements, Captions [Line Items]</link:label>
    <link:label id="lab_srt_CondensedCashFlowStatementsCaptionsLineItems_label_en-US" xlink:label="lab_srt_CondensedCashFlowStatementsCaptionsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Condensed Cash Flow Statements, Captions [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedCashFlowStatementsCaptionsLineItems" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_CondensedCashFlowStatementsCaptionsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems" xlink:to="lab_srt_CondensedCashFlowStatementsCaptionsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EarningsPerShareBasicLineItems_ecdd30a9-9b0b-426d-a3c4-aa8f4a7968e9_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasicLineItems_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems" xlink:to="lab_us-gaap_EarningsPerShareBasicLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FederalHomeLoanBankAdvancesMember_100faf4e-794f-49f6-af77-a64d82aeb0bf_terseLabel_en-US" xlink:label="lab_us-gaap_FederalHomeLoanBankAdvancesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank Advances [Member]</link:label>
    <link:label id="lab_us-gaap_FederalHomeLoanBankAdvancesMember_label_en-US" xlink:label="lab_us-gaap_FederalHomeLoanBankAdvancesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank Advances [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesMember" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FederalHomeLoanBankAdvancesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FederalHomeLoanBankAdvancesMember" xlink:to="lab_us-gaap_FederalHomeLoanBankAdvancesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable_78fff788-38f8-494b-98c2-742c6aebad7d_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable" xlink:to="lab_us-gaap_ScheduleOfOtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_c7c6fe0b-fcc7-445e-a4df-d4b77b007296_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from loan sales</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from Sale of Mortgage Loans Held-for-sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale" xlink:to="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_1d1b639c-721d-4c21-aa95-19380042a894_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_FinancingReceivableLoanToValueRatioMaximum_4d910633-982e-4b78-afcb-8bae1358c14a_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableLoanToValueRatioMaximum" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum percentage of loan</link:label>
    <link:label id="lab_isba_FinancingReceivableLoanToValueRatioMaximum_label_en-US" xlink:label="lab_isba_FinancingReceivableLoanToValueRatioMaximum" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Loan To Value Ratio, Maximum</link:label>
    <link:label id="lab_isba_FinancingReceivableLoanToValueRatioMaximum_documentation_en-US" xlink:label="lab_isba_FinancingReceivableLoanToValueRatioMaximum" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Loan To Value Ratio, Maximum</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_FinancingReceivableLoanToValueRatioMaximum" xlink:href="isba-20210331.xsd#isba_FinancingReceivableLoanToValueRatioMaximum"/>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_a55c2f17-d581-4449-9383-be8a553b99bb_verboseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired loans with a valuation allowance, Unpaid Principal Balance</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance"/>
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    <link:label id="lab_us-gaap_StatementTable_998b475c-ec97-44b9-98fa-3e394f93359e_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement [Table]</link:label>
    <link:label id="lab_us-gaap_StatementTable_label_en-US" xlink:label="lab_us-gaap_StatementTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementTable" xlink:to="lab_us-gaap_StatementTable" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember_1308c615-9547-49b2-b185-a422b2c40990_terseLabel_en-US" xlink:label="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Residential, Privately Insured, Financing Receivable [Member]</link:label>
    <link:label id="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember_label_en-US" xlink:label="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Residential, Privately Insured, Financing Receivable [Member]</link:label>
    <link:label id="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember_documentation_en-US" xlink:label="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Residential, Privately Insured, Financing Receivable [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_ResidentialPrivatelyInsuredFinancingReceivableMember" xlink:href="isba-20210331.xsd#isba_ResidentialPrivatelyInsuredFinancingReceivableMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_ResidentialPrivatelyInsuredFinancingReceivableMember" xlink:to="lab_isba_ResidentialPrivatelyInsuredFinancingReceivableMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_EquityMethodInvesteeNameDomain_ed2d4443-265d-4bda-a618-5dc5623fb9e1_terseLabel_en-US" xlink:label="lab_srt_EquityMethodInvesteeNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Name [Domain]</link:label>
    <link:label id="lab_srt_EquityMethodInvesteeNameDomain_label_en-US" xlink:label="lab_srt_EquityMethodInvesteeNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_EquityMethodInvesteeNameDomain" xlink:to="lab_srt_EquityMethodInvesteeNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_ConsumerSecuredFinancingReceivableMember_ea477d75-68cf-444a-9dee-56839a5a3786_verboseLabel_en-US" xlink:label="lab_isba_ConsumerSecuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer secured [Member]</link:label>
    <link:label id="lab_isba_ConsumerSecuredFinancingReceivableMember_label_en-US" xlink:label="lab_isba_ConsumerSecuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Secured Financing Receivable [Member]</link:label>
    <link:label id="lab_isba_ConsumerSecuredFinancingReceivableMember_documentation_en-US" xlink:label="lab_isba_ConsumerSecuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Secured Financing Receivable [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_ConsumerSecuredFinancingReceivableMember" xlink:href="isba-20210331.xsd#isba_ConsumerSecuredFinancingReceivableMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_ConsumerSecuredFinancingReceivableMember" xlink:to="lab_isba_ConsumerSecuredFinancingReceivableMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_abebcc2d-3dbc-41d9-b105-358651485efe_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to Acquire Debt Securities, Available-for-sale</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:to="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_8b57b4e0-2fae-4f0a-9522-ff37a52b4459_terseLabel_en-US" xlink:label="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of loans restructured through the forbearance of principal or accrued interest</link:label>
    <link:label id="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_label_en-US" xlink:label="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restructure of Loans through Forbearance of Principal or Accrued Interest</link:label>
    <link:label id="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest_documentation_en-US" xlink:label="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restructure of loans through the forbearance of principal or accrued interest.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:href="isba-20210331.xsd#isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:to="lab_isba_RestructureOfLoansThroughForbearanceOfPrincipalOrAccruedInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_2cd71703-f78d-4630-afa5-ae2b2e4a9b37_verboseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net gain on sale of mortgage loans</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_2a45d19b-3ef5-4133-86cc-12b7f21ae12d_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net gain on sale of mortgage loans</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain (Loss) on Sale of Mortgage Loans</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfMortgageLoans" xlink:to="lab_us-gaap_GainLossOnSaleOfMortgageLoans" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_ForeclosedAssetMember_8ea5ed0e-0fd3-4c38-bf37-de8199223e3b_terseLabel_en-US" xlink:label="lab_isba_ForeclosedAssetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreclosed Asset</link:label>
    <link:label id="lab_isba_ForeclosedAssetMember_label_en-US" xlink:label="lab_isba_ForeclosedAssetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreclosed Asset [Member]</link:label>
    <link:label id="lab_isba_ForeclosedAssetMember_documentation_en-US" xlink:label="lab_isba_ForeclosedAssetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Foreclosed Asset [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_ForeclosedAssetMember" xlink:href="isba-20210331.xsd#isba_ForeclosedAssetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_ForeclosedAssetMember" xlink:to="lab_isba_ForeclosedAssetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ParentCompanyMember_cdd8bf56-a3e4-497c-bfef-80d180cca3ea_verboseLabel_en-US" xlink:label="lab_srt_ParentCompanyMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Parent Company [Member]</link:label>
    <link:label id="lab_srt_ParentCompanyMember_label_en-US" xlink:label="lab_srt_ParentCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Parent Company [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ParentCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ParentCompanyMember" xlink:to="lab_srt_ParentCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_f128008e-ac43-40fe-b66e-755258081322_verboseLabel_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Consumer [Member]</link:label>
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_0a6daba1-6979-427d-a766-72df596ec92d_terseLabel_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Portfolio Segment [Member]</link:label>
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_label_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Portfolio Segment [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsumerPortfolioSegmentMember" xlink:to="lab_us-gaap_ConsumerPortfolioSegmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_14fe48bb-929f-4c99-81ef-5d520f4496c2_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">INVESTING ACTIVITIES</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_67f37698-be72-4888-92c8-388bc1bcee6e_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromInvestmentsAbstract_f205b25e-d434-4ead-858f-f4c4fbfaedef_verboseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromInvestmentsAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Activity in AFS securities</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromInvestmentsAbstract_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromInvestmentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments for (Proceeds from) Investments [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromInvestmentsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForProceedsFromInvestmentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForProceedsFromInvestmentsAbstract" xlink:to="lab_us-gaap_PaymentsForProceedsFromInvestmentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MaximumMember_50127721-e580-4e8b-9ce6-446e84508972_verboseLabel_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum [Member]</link:label>
    <link:label id="lab_srt_MaximumMember_5d38ad25-7100-48ae-8213-8734b21de218_terseLabel_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum [Member]</link:label>
    <link:label id="lab_srt_MaximumMember_label_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember" xlink:to="lab_srt_MaximumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DesignatedAsHedgingInstrumentMember_13facb5b-eb2d-4f92-b006-507af44ae067_terseLabel_en-US" xlink:label="lab_us-gaap_DesignatedAsHedgingInstrumentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Designated as Hedging Instrument [Member]</link:label>
    <link:label id="lab_us-gaap_DesignatedAsHedgingInstrumentMember_label_en-US" xlink:label="lab_us-gaap_DesignatedAsHedgingInstrumentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Designated as Hedging Instrument [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DesignatedAsHedgingInstrumentMember" xlink:to="lab_us-gaap_DesignatedAsHedgingInstrumentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_034c5a86-3a39-404e-946a-5501e9c35f95_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFinancingReceivablesPastDueTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Past Due [Table]</link:label>
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    <link:label id="lab_srt_MinimumMember_label_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Minimum [Member]</link:label>
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    <link:label id="lab_us-gaap_MarketableSecuritiesPolicy_3f5097a4-e51f-4db4-baf3-1016749c7af2_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Available-for-sale Securities</link:label>
    <link:label id="lab_us-gaap_MarketableSecuritiesPolicy_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marketable Securities, Policy [Policy Text Block]</link:label>
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    <link:label id="lab_isba_LowSatisfactoryRatingMember_f209d4ff-ecab-4816-bbc5-15365cbe4975_verboseLabel_en-US" xlink:label="lab_isba_LowSatisfactoryRatingMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">4 - Low satisfactory [Member]</link:label>
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    <link:label id="lab_isba_LowSatisfactoryRatingMember_documentation_en-US" xlink:label="lab_isba_LowSatisfactoryRatingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Low satisfactory rating.</link:label>
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    <link:label id="lab_us-gaap_MortgageBackedSecuritiesMember_246d024b-c9dd-4d50-9144-b063de748695_verboseLabel_en-US" xlink:label="lab_us-gaap_MortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mortgage-backed securities [Member]</link:label>
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    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_1d599aff-f0e3-42c5-b148-2eefbf373319_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturing, After Ten Years, Fair value</link:label>
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    <link:label id="lab_us-gaap_OccupancyNet_31bade25-6630-4a28-b62d-1af1475cecca_verboseLabel_en-US" xlink:label="lab_us-gaap_OccupancyNet" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Occupancy</link:label>
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    <link:label id="lab_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_5835c600-e6a5-4ccf-950a-c26d2be97544_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments, Debt and Equity Securities [Abstract]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationDomain" xlink:to="lab_us-gaap_BalanceSheetLocationDomain" xlink:type="arc" order="1"/>
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    <link:label id="lab_isba_SummaryOfOtherNoninterestExpensesAbstract_ebb825af-a34e-4396-bc59-825cc6a661b8_verboseLabel_en-US" xlink:label="lab_isba_SummaryOfOtherNoninterestExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of expenses included in other noninterest expenses</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment_fd51fb2b-5c93-424c-8c24-d03a93987ce2_verboseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired loans with a valuation allowance, Average Outstanding Balance</link:label>
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    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_e4de6e0e-60d1-4c0b-b353-9f4708a1d62b_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Borrowed Funds</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_9014adec-1ffd-4416-ac3f-ddd20f33faa6_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">FINANCING ACTIVITIES</link:label>
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    <link:label id="lab_us-gaap_TypeOfAdoptionMember_191be3f3-3465-4cdb-bc9c-65d815723d52_terseLabel_en-US" xlink:label="lab_us-gaap_TypeOfAdoptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Type of Adoption [Domain]</link:label>
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    <link:label id="lab_us-gaap_FederalHomeLoanBankAdvancesFloatingRate_93cee93b-5c11-43ab-b968-ce07cc538d68_terseLabel_en-US" xlink:label="lab_us-gaap_FederalHomeLoanBankAdvancesFloatingRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank, Advances, Floating Rate</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_54c375f4-be10-453d-b5c4-7d72f07a9bc5_totalLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired loans, Unpaid Principal Balance</link:label>
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    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9e8391bb-1e52-4eea-ab6a-93d8b36f08b7_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1da15008-f76b-4692-b982-bde3061e1de7_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Advance in connection with impaired loans</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Troubled Debt Restructuring, Commitment to Lend</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend"/>
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    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_6835224c-6a5e-430c-9cb3-c42e08559af6_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturing, After Ten Years</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis"/>
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    <link:label id="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_4299c6f5-5054-4e01-8e30-5c78fbc87ecc_terseLabel_en-US" xlink:label="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commercial Advances to Mortgage Brokers Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_label_en-US" xlink:label="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commercial Advances to Mortgage Brokers Segment [Member]</link:label>
    <link:label id="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember_documentation_en-US" xlink:label="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commercial Advances to Mortgage Brokers Segment [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:href="isba-20210331.xsd#isba_CommercialAdvancestoMortgageBrokersSegmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:to="lab_isba_CommercialAdvancestoMortgageBrokersSegmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestReceivable_fcc5fff2-3908-41b9-b675-476c327270c8_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestReceivable" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accrued interest receivable</link:label>
    <link:label id="lab_us-gaap_InterestReceivable_label_en-US" xlink:label="lab_us-gaap_InterestReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestReceivable" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestReceivable" xlink:to="lab_us-gaap_InterestReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDue_4e60b8ce-699f-4de3-95a7-70c1284b2fdc_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Past Due</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDue_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Past Due</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDue"/>
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    <link:label id="lab_isba_DerivativeNotionalAmount1_label_en-US" xlink:label="lab_isba_DerivativeNotionalAmount1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative, Notional Amount1</link:label>
    <link:label id="lab_isba_DerivativeNotionalAmount1_documentation_en-US" xlink:label="lab_isba_DerivativeNotionalAmount1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative, Notional Amount1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_DerivativeNotionalAmount1" xlink:href="isba-20210331.xsd#isba_DerivativeNotionalAmount1"/>
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    <link:label id="lab_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_c7f2a938-21e8-4d5a-8a10-74472cb73969_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of derivative instruments</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock" xlink:to="lab_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance_3877fe72-aced-478c-8532-d86f7da36cc8_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired loans, Valuation Allowance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired Financing Receivable, Related Allowance</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableRelatedAllowance"/>
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    <link:label id="lab_isba_LoansReceivableCollateralizedByCashCropInventoryMember_fc5559be-b9d3-4dcc-88ab-81e88cec28a9_terseLabel_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByCashCropInventoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Cash Crop Inventory [Member]</link:label>
    <link:label id="lab_isba_LoansReceivableCollateralizedByCashCropInventoryMember_label_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByCashCropInventoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Cash Crop Inventory [Member]</link:label>
    <link:label id="lab_isba_LoansReceivableCollateralizedByCashCropInventoryMember_documentation_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByCashCropInventoryMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Cash Crop Inventory [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_LoansReceivableCollateralizedByCashCropInventoryMember" xlink:href="isba-20210331.xsd#isba_LoansReceivableCollateralizedByCashCropInventoryMember"/>
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    <link:label id="lab_us-gaap_ValuationTechniqueAxis_2e0700e3-c4a9-48d9-8890-5f344523ab04_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationTechniqueAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation Approach and Technique [Axis]</link:label>
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    <link:label id="lab_isba_DeferredCompensationArrangementwithIndividualDeferredCompensationObligations_9e9372e5-df3b-4e9b-8941-3c83b1d24e29_terseLabel_en-US" xlink:label="lab_isba_DeferredCompensationArrangementwithIndividualDeferredCompensationObligations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares to be issued for deferred compensation obligations</link:label>
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    <link:label id="lab_isba_DeferredCompensationArrangementwithIndividualDeferredCompensationObligations_documentation_en-US" xlink:label="lab_isba_DeferredCompensationArrangementwithIndividualDeferredCompensationObligations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Compensation Arrangement with Individual, Deferred Compensation Obligations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_DeferredCompensationArrangementwithIndividualDeferredCompensationObligations" xlink:href="isba-20210331.xsd#isba_DeferredCompensationArrangementwithIndividualDeferredCompensationObligations"/>
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    <link:label id="lab_dei_EntityAddressCityOrTown_d15cdaf5-ef9c-45f3-802c-724710c96611_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
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    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_bba000cc-4475-4762-9c49-69df7ea06a4f_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additional Paid-in Capital</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_38acb686-a9c7-4c5c-b500-77cdd144594c_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturities and calls</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestmentAbstract_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestmentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired Financing Receivable, Average Recorded Investment [Abstract]</link:label>
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    <link:label id="lab_us-gaap_FinancingReceivablesPeriodPastDueAxis_61374c48-bb2c-462e-81a9-2b2693c16455_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivablesPeriodPastDueAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Asset, Period Past Due [Axis]</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_70f59ec7-d9fb-4303-b90b-ea4d4591f273_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_01546a24-78fd-4a3a-910a-e7cfc31a5d75_terseLabel_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Residential Real Estate [Member]</link:label>
    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_f10c6a6e-4890-4f30-89fa-6c91e97d5242_verboseLabel_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total residential real estate [Member]</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_85ab231c-a6a2-4860-bb51-a1de317a9b98_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total cash and cash equivalents</link:label>
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    <link:label id="lab_isba_IsabellaBankCorporationRestrictedStockPlanMember_cd61cd5b-fa70-4b58-a3b0-ebb761a9f669_terseLabel_en-US" xlink:label="lab_isba_IsabellaBankCorporationRestrictedStockPlanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Isabella Bank Corporation Restricted Stock Plan</link:label>
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    <link:label id="lab_isba_IsabellaBankCorporationRestrictedStockPlanMember_documentation_en-US" xlink:label="lab_isba_IsabellaBankCorporationRestrictedStockPlanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Isabella Bank Corporation Restricted Stock Plan</link:label>
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    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_d07f52fa-abae-4470-ba59-3241585dcd8f_verboseLabel_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Average potential effect of common shares in the Directors Plan</link:label>
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    <link:label id="lab_us-gaap_NoninterestIncomeAbstract_b627deb7-00cf-40b1-957d-3e47d29e2234_verboseLabel_en-US" xlink:label="lab_us-gaap_NoninterestIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Noninterest income</link:label>
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    <link:label id="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses_f3c98e9a-04a8-4987-a85c-1ff3c075c85a_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForLoanLeaseAndOtherLosses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Provision for loan losses</link:label>
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    <link:label id="lab_isba_LoansReceivableGrossFairValueDisclosure_d56f95b4-6df7-4516-82a6-b25505f3d6c4_verboseLabel_en-US" xlink:label="lab_isba_LoansReceivableGrossFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total loans</link:label>
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    <link:label id="lab_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_c8ecc855-92f8-4be4-95ab-2fa2cb422a14_terseLabel_en-US" xlink:label="lab_us-gaap_AOCIAttributableToParentNetOfTaxRollForward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AOCI Attributable to Parent, Net of Tax [Roll Forward]</link:label>
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    <link:label id="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2021Member_d8d1cea8-fbe3-482c-9842-6faf376611af_terseLabel_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2021Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fixed Rate Advances Due 2021 [Member]</link:label>
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2021Member_label_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2021Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank, Advances, Fixed Rate Due 2021 [Member]</link:label>
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2021Member_documentation_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2021Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank, Advances, Fixed Rate Due 2021 [Member] [Member]</link:label>
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    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_5307e316-49a1-4894-9605-bf6f7ce47994_terseLabel_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Components [Axis]</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_df0dbfba-f1f1-444f-86c8-a7ac8a83d6c7_totalLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired loans, Average Outstanding Balance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired Financing Receivable, Average Recorded Investment</link:label>
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    <link:label id="lab_isba_AgriculturalPortfolioSegmentMember_00eff90a-ee6d-4cf6-8aae-5216b1ac7c3d_terseLabel_en-US" xlink:label="lab_isba_AgriculturalPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Agricultural [Member]</link:label>
    <link:label id="lab_isba_AgriculturalPortfolioSegmentMember_54296392-2260-4135-b501-4796ce89f034_verboseLabel_en-US" xlink:label="lab_isba_AgriculturalPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total agricultural [Member]</link:label>
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    <link:label id="lab_isba_AgriculturalPortfolioSegmentMember_documentation_en-US" xlink:label="lab_isba_AgriculturalPortfolioSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Agricultural portfolio segment.</link:label>
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    <link:label id="lab_isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod_716eaa20-c180-496a-93d8-fd4e46a4473a_verboseLabel_en-US" xlink:label="lab_isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of days past due (or more), accrual of interest discontinued</link:label>
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    <link:label id="lab_isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod_documentation_en-US" xlink:label="lab_isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, Nonperforming, Nonaccrual Of Interest, Threshold Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod" xlink:href="isba-20210331.xsd#isba_FinancingReceivableNonperformingNonaccrualOfInterestThresholdPeriod"/>
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    <link:label id="lab_us-gaap_FinanceLoansAndLeasesReceivablePolicy_32f59c33-05e6-4955-a0bb-5e2bc0dcab8c_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLoansAndLeasesReceivablePolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable</link:label>
    <link:label id="lab_us-gaap_FinanceLoansAndLeasesReceivablePolicy_label_en-US" xlink:label="lab_us-gaap_FinanceLoansAndLeasesReceivablePolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable [Policy Text Block]</link:label>
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    <link:label id="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member_f869b361-6dfd-446c-9a15-c7d77300b854_terseLabel_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fixed Rate Advances Due 2019 [Member]</link:label>
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member_label_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank, Advances, Fixed Rate Due 2019 [Member]</link:label>
    <link:label id="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member_documentation_en-US" xlink:label="lab_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal Home Loan Bank, Advances, Fixed Rate Due 2019 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member" xlink:href="isba-20210331.xsd#isba_FederalHomeLoanBankAdvancesFixedRateDue2019Member"/>
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    <link:label id="lab_us-gaap_StockholdersEquity_5e700ae9-2e63-42ee-bdca-394bed885cdf_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total shareholders' equity</link:label>
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    <link:label id="lab_us-gaap_InformationByCategoryOfDebtSecurityAxis_c5dcebcc-fa50-4e9c-bc10-5793b5baa33b_terseLabel_en-US" xlink:label="lab_us-gaap_InformationByCategoryOfDebtSecurityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Security Category [Axis]</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_bcee1f66-74db-4e07-835e-0ced64f500d1_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net cash provided by (used in) operating activities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HedgingRelationshipDomain" xlink:to="lab_us-gaap_HedgingRelationshipDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_ConsumerUnsecuredFinancingReceivableMember_eaab9235-878c-473c-8916-11d19b0a4be9_verboseLabel_en-US" xlink:label="lab_isba_ConsumerUnsecuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Unsecured Financing Receivable [Member]</link:label>
    <link:label id="lab_isba_ConsumerUnsecuredFinancingReceivableMember_label_en-US" xlink:label="lab_isba_ConsumerUnsecuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Unsecured Financing Receivable [Member]</link:label>
    <link:label id="lab_isba_ConsumerUnsecuredFinancingReceivableMember_documentation_en-US" xlink:label="lab_isba_ConsumerUnsecuredFinancingReceivableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer Unsecured Financing Receivable [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_ConsumerUnsecuredFinancingReceivableMember" xlink:href="isba-20210331.xsd#isba_ConsumerUnsecuredFinancingReceivableMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_ConsumerUnsecuredFinancingReceivableMember" xlink:to="lab_isba_ConsumerUnsecuredFinancingReceivableMember" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_StateandLocalFundsPurchasedMember_ecf4371c-50b4-4bbb-94aa-cb79d8f322f2_terseLabel_en-US" xlink:label="lab_isba_StateandLocalFundsPurchasedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">State and Local Funds Purchased [Member]</link:label>
    <link:label id="lab_isba_StateandLocalFundsPurchasedMember_label_en-US" xlink:label="lab_isba_StateandLocalFundsPurchasedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">State and Local Funds Purchased [Member]</link:label>
    <link:label id="lab_isba_StateandLocalFundsPurchasedMember_documentation_en-US" xlink:label="lab_isba_StateandLocalFundsPurchasedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">State and Local Funds Purchased [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_StateandLocalFundsPurchasedMember" xlink:href="isba-20210331.xsd#isba_StateandLocalFundsPurchasedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_StateandLocalFundsPurchasedMember" xlink:to="lab_isba_StateandLocalFundsPurchasedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount_46b9402c-0b91-4f08-b51f-b5f0585abd8b_negatedTerseLabel_en-US" xlink:label="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest income on tax exempt municipal securities</link:label>
    <link:label id="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount_label_en-US" xlink:label="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Tax Exempt Income, Municipal Securities, Amount</link:label>
    <link:label id="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount_documentation_en-US" xlink:label="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Tax Exempt Income, Municipal Securities, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount" xlink:href="isba-20210331.xsd#isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount" xlink:to="lab_isba_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeMunicipalSecuritiesAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract_0b05d380-2260-44df-b3f6-66dd9664603e_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired Financing Receivable, Recorded Investment [Abstract]</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Impaired Financing Receivable, Recorded Investment [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract" xlink:to="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestIncomeExpenseNet_ddc8529e-f3f1-47f6-ad76-4b48b92abf15_totalLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNet" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net interest income</link:label>
    <link:label id="lab_us-gaap_InterestIncomeExpenseNet_label_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Income (Expense), Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestIncomeExpenseNet" xlink:to="lab_us-gaap_InterestIncomeExpenseNet" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_MembershipsandSubscriptionsExpense_24b95de7-1da6-43b2-bed4-3d2312e42625_terseLabel_en-US" xlink:label="lab_isba_MembershipsandSubscriptionsExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Memberships and Subscriptions Expense</link:label>
    <link:label id="lab_isba_MembershipsandSubscriptionsExpense_label_en-US" xlink:label="lab_isba_MembershipsandSubscriptionsExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Memberships and Subscriptions Expense</link:label>
    <link:label id="lab_isba_MembershipsandSubscriptionsExpense_documentation_en-US" xlink:label="lab_isba_MembershipsandSubscriptionsExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Memberships and Subscriptions Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_MembershipsandSubscriptionsExpense" xlink:href="isba-20210331.xsd#isba_MembershipsandSubscriptionsExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_MembershipsandSubscriptionsExpense" xlink:to="lab_isba_MembershipsandSubscriptionsExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashFlowHedgingMember_ec10eaf0-4a5c-4783-9ba0-52c2e5241aeb_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowHedgingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash Flow Hedging [Member]</link:label>
    <link:label id="lab_us-gaap_CashFlowHedgingMember_label_en-US" xlink:label="lab_us-gaap_CashFlowHedgingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash Flow Hedging [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashFlowHedgingMember" xlink:to="lab_us-gaap_CashFlowHedgingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_dc17d23d-e728-4011-b7d1-8947151abaf3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_Printingandsuppliesexpense_a1dd7025-ee6f-4740-842c-db2599b05342_terseLabel_en-US" xlink:label="lab_isba_Printingandsuppliesexpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Printing and supplies expense</link:label>
    <link:label id="lab_isba_Printingandsuppliesexpense_label_en-US" xlink:label="lab_isba_Printingandsuppliesexpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Printing and supplies expense</link:label>
    <link:label id="lab_isba_Printingandsuppliesexpense_documentation_en-US" xlink:label="lab_isba_Printingandsuppliesexpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Printing and supplies expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_Printingandsuppliesexpense" xlink:href="isba-20210331.xsd#isba_Printingandsuppliesexpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_Printingandsuppliesexpense" xlink:to="lab_isba_Printingandsuppliesexpense" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InternalCreditAssessmentAxis_4e6b3435-cea9-46d2-a63f-3c1d278f0205_terseLabel_en-US" xlink:label="lab_us-gaap_InternalCreditAssessmentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Internal Credit Assessment [Axis]</link:label>
    <link:label id="lab_us-gaap_InternalCreditAssessmentAxis_label_en-US" xlink:label="lab_us-gaap_InternalCreditAssessmentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Internal Credit Assessment [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis" xlink:to="lab_us-gaap_InternalCreditAssessmentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount_e841a3ed-adf9-4513-acd8-ae6583c627fd_totalLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net loans</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans and Leases Receivable, Net Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:to="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate_d16e7e34-1371-468f-a991-d879dc6de236_verboseLabel_en-US" xlink:label="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Agricultural</link:label>
    <link:label id="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate_label_en-US" xlink:label="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Gross, Agricultural and Agricultural Real Estate</link:label>
    <link:label id="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate_documentation_en-US" xlink:label="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Gross, Agricultural and Agricultural Real Estate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" xlink:href="isba-20210331.xsd#isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" xlink:to="lab_isba_LoansReceivableGrossAgriculturalandAgriculturalRealEstate" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ConsolidatedEntitiesDomain_66366cb8-a427-4955-b56f-a7017afaf915_terseLabel_en-US" xlink:label="lab_srt_ConsolidatedEntitiesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidated Entities [Domain]</link:label>
    <link:label id="lab_srt_ConsolidatedEntitiesDomain_label_en-US" xlink:label="lab_srt_ConsolidatedEntitiesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidated Entities [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidatedEntitiesDomain" xlink:to="lab_srt_ConsolidatedEntitiesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember_f70136fe-4cfe-491b-8da9-681472aa3908_terseLabel_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Other Inventory [Member]</link:label>
    <link:label id="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember_label_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Other Inventory [Member]</link:label>
    <link:label id="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember_documentation_en-US" xlink:label="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans Receivable, Collateralized By Other Inventory [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_isba_LoansReceivableCollateralizedByOtherInventoryMember" xlink:href="isba-20210331.xsd#isba_LoansReceivableCollateralizedByOtherInventoryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_LoansReceivableCollateralizedByOtherInventoryMember" xlink:to="lab_isba_LoansReceivableCollateralizedByOtherInventoryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock_6f25c306-935a-4780-9cb5-f180ebdf9ef3_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to Acquire Federal Home Loan Bank Stock</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to Acquire Federal Home Loan Bank Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireFederalHomeLoanBankStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock" xlink:to="lab_us-gaap_PaymentsToAcquireFederalHomeLoanBankStock" xlink:type="arc" order="1"/>
    <link:label id="lab_isba_ManagementFeesAndOtherIncome_def93877-29bf-431d-8742-3a9fed4eccea_verboseLabel_en-US" xlink:label="lab_isba_ManagementFeesAndOtherIncome" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Management fee and other</link:label>
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    <link:label id="lab_isba_ManagementFeesAndOtherIncome_documentation_en-US" xlink:label="lab_isba_ManagementFeesAndOtherIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Management Fees And Other Income</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_isba_AgriculturalOtherPortfolioSegmentMember" xlink:href="isba-20210331.xsd#isba_AgriculturalOtherPortfolioSegmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_isba_AgriculturalOtherPortfolioSegmentMember" xlink:to="lab_isba_AgriculturalOtherPortfolioSegmentMember" xlink:type="arc" order="1"/>
  </link:labelLink>
</link:linkbase>
