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Investment Securities - Additional information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) position | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) position | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Investment Securities: |  |  |  |  |
Proceeds from sales of investment securities - available for sale | $ 0 | $ 0 | $ 960,000 | $ 0 |
Gross investment gains |  |  | 84,000 |  |
Book value of securities available for sale and held to maturity | $ 119,809,000 |  | $ 119,809,000 |  | $ 111,694,000
Number of positions | position | 73 |  | 73 |  |
Premium percentage on mortgage backed securities purchased |  |  | 101.10% |  |
Consolidated investment securities portfolio modified, years |  |  | 37 months 3 days |  | 25 months 12 days
Standard & Poor's, AAA Rating [Member] |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Portfolio rated | 47.60% |  | 47.60% |  | 42.20%
Securities rated below A [Member] |  |  |  |  |
INVESTMENT SECURITIES |  |  |  |  |
Portfolio rated | 15.00% |  | 15.00% |  | 15.20%
Maximum |  |  |  |  |
Investment Securities: |  |  |  |  |
Consolidated investment securities portfolio modified, years |  |  | 60 months |  |

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