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Investment Securities - Additional information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 USD ($) position | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) position | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Investment Securities: |  |  |  |  |
Proceeds from sales of investment securities - available for sale | $ 0 | $ 960,000 | $ 0 | $ 960,000 |
Gross investment gains |  | $ 84,000 |  | $ 84,000 |
Book value of securities available for sale and held to maturity | $ 122,240,000 |  | $ 122,240,000 |  | $ 122,574,000
Number of positions | position | 376 |  | 376 |  |
Premium percentage on mortgage backed securities purchased |  |  | 100.90% |  |
Consolidated investment securities portfolio modified, years |  |  | 52 months |  | 41 months 15 days
Standard & Poor's, AAA Rating |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Portfolio rated | 52.20% |  | 52.20% |  | 47.10%
Securities rated below A |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Portfolio rated | 13.30% |  | 13.30% |  | 14.70%
Maximum |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 60 months |  |

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