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Investment Securities - Additional information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) position | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Investment Securities: |  |  |
Premium percentage on mortgage backed securities purchased | 101.10% |  |
Consolidated investment securities portfolio modified, years | 39 months 12 days |  | 25 months 12 days
Proceeds from sales of investment securities — available for sale | $ 0 | $ 0 |
Book value of securities available for sale and held to maturity | $ 123,462,000 |  | $ 111,694,000
Number of positions | position | 76 |  |
Available-for-sale Securities, Equity Securities | $ 474,000 |  | $ 443,000
Standard & Poor's, AAA Rating [Member] |  |  |
INVESTMENT SECURITIES |  |  |
Portfolio rated | 47.10% |  | 42.20%
Securities rated below A [Member] |  |  |
INVESTMENT SECURITIES |  |  |
Portfolio rated | 13.80% |  | 15.20%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member] |  |  |
Investment Securities: |  |  |
Available-for-sale Securities, Equity Securities | $ 474,000 |  | $ 443,000
Maximum |  |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 60 months |  |

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