XML 46 R34.htm IDEA: XBRL DOCUMENT v3.20.4

Nature of Operations and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of equity method and other investments

Equity securities without readily determinable fair values consist of the following holdings as of December 31:

			2020						2019
FHLB Stock			$	15,050					$	15,050
Investment in joint venture			—						4,246
FRB Stock			1,999						1,999
Other			334						334
Total			$	17,383					$	21,629

X

- Definition

Schedule of Equity Method And Other Investments [Table Text Block]

+ References

No definition available.

+ Details

Name:	isba_ScheduleofEquityMethodAndOtherInvestmentsTableTextBlock
Namespace Prefix:	isba_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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