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Investment Securities - Additional information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 24 months 21 days |  | 36 months 27 days
Book value of securities available for sale and held to maturity | $ 117,364,000 |  | $ 117,076,000
Available-for-sale, Securities and Held To Maturity Securities in Unrealized Loss Positions | 34 |  |
Standard & Poor's, AAA Rating [Member] |  |  |
INVESTMENT SECURITIES |  |  |
Portfolio rated | 52.10% |  | 53.40%
Securities rated below A [Member] |  |  |
INVESTMENT SECURITIES |  |  |
Portfolio rated | 9.80% |  | 9.10%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member] |  |  |
Investment Securities: |  |  |
Equity Securities, FV-NI | $ 386,000 |  | $ 366,000
Equity securities, realized gain | 6,000 | $ 0 |
Equity securities, unrealized loss | $ 6,000 | $ 0 |
Minimum |  |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 24 months |  |
Maximum |  |  |
Investment Securities: |  |  |
Consolidated investment securities portfolio modified, years | 60 months |  |

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