XML 92 R80.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Off-Balance-Sheet Activities (Contractual amount of credit related financial instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract Amount | $ 265,306 | $ 274,540
Maximum maturity period of commitments to extend credit | 1 year |
Unfunded commitments under lines of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract Amount | $ 231,120 | 241,637
Commercial and standby letters of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract Amount | 1,738 | 5,964
Commitments to grant loans [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contract Amount | $ 32,448 | $ 26,939

X
- Definition Maximum maturity period of commitments to extend credit. + References No definition available. + Details
Name: | isba_CommitmentMaturityPeriod
Namespace Prefix: | isba_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_LoanOriginationCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |