XML 51 R39.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Deposits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Deposits [Abstract] |
Scheduled maturities of time deposits | Scheduled annual maturities of time deposits for each of the next five years, and thereafter, are as follows:
| Scheduled Maturities of Time Deposits
2022 | $ | 180,936 |
2023 | 55,448 |
2024 | 21,215 |
2025 | 23,163 |
2026 | 19,919 |
Thereafter | 81 |
Total | $ | 300,762 |

X
- Definition Scheduled maturities of time deposits. + References No definition available. + Details
Name: | isba_ScheduledMaturitiesOfTimeDepositsTableTextBlock
Namespace Prefix: | isba_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
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