XML 84 R71.htm IDEA: XBRL DOCUMENT v3.25.0.1

Borrowed Funds (Pledged financial instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	$ 67,539	$ 67,764
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	395,286	391,529
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	67,539	67,764
Deposit Liabilities, Collateral Issued, Financial Instruments	86,162	84,099
Total	548,987	543,392
US Treasury Securities
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	57,271	55,623
Mortgage Backed Securities, Other [Member]
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	7,979	9,462
Collateralized Mortgage Obligations [Member]
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	$ 2,289	$ 2,679

X

- Definition

Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date

+ References

No definition available.

+ Details

Name:	isba_PledgedFinancialInstrumentsAvailableforSaleSecuritieswithoutSingleMaturityDate
Namespace Prefix:	isba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Pledged Financial Instruments, Not Separately Reported, Securities And Loans Receivable Pledged As Collateral

+ References

No definition available.

+ Details

Name:	isba_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesAndLoansReceivablePledgedAsCollateral
Namespace Prefix:	isba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

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

X

- Definition

Amount of the collateral pledged in support of federal home loan bank advances outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478878/942-470-45-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-12

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_MortgageBackedSecuritiesOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: