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Borrowed Funds (Borrowed funds obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Debt [Line Items]
Borrowed funds	$ 99,320	$ 158,747
Securities Sold under Agreements to Repurchase [Member]
Schedule of Debt [Line Items]
Borrowed funds	$ 50,162	$ 68,747
Borrowed funds, Rate	0.07%	0.13%

X

- Definition

[Line Items] for Schedule of Debt [Table]

+ References

No definition available.

+ Details

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Namespace Prefix:	isba_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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