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Investment Securities - Additional information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) position | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Investment Securities: |  |  |
Proceeds from sales of investment securities - available for sale | $ 0 | $ 0 |
Book value of securities available for sale and held to maturity | $ 120,771,000 |  | $ 122,574,000
Number of positions | position | 245 |  |
Premium percentage on mortgage backed securities purchased | 101.00% |  |
Consolidated investment securities portfolio modified, years | 50 months 15 days |  | 41 months 15 days
Standard & Poor's, AAA Rating |  |  |
INVESTMENT SECURITIES |  |  |
Portfolio rated | 49.40% |  | 47.10%
Securities rated below A |  |  |
INVESTMENT SECURITIES |  |  |
Portfolio rated | 14.10% |  | 14.70%
Maximum |  |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 60 months |  |

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