XML 82 R69.htm IDEA: XBRL DOCUMENT v3.25.0.1

Deposits (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deposits [Abstract]
Interest Expense, Time Deposits, Greater than $250,000	$ 5,540	$ 3,419	$ 621

X

- Definition

Interest Expense, Time Deposits, Greater than $250,000

+ References

No definition available.

+ Details

Name:	isba_InterestExpenseTimeDepositsGreaterthan250000
Namespace Prefix:	isba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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