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Off-Balance Sheet Activities - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Amortization | $ 634 | $ 531 | $ 533
Small Business Investment Corporations |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Capital contributions | 3,665 | 5,831 |
Low Income Housing Partnerships |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Capital contributions | 3,624 | 4,190 |
Capital Contributions, Small Business Investment Corporation |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Capital contributions | 11,835 | 9,669 |
Capital Contributions, Low Income Housing Partnerships |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Capital contributions | $ 6,015 | $ 6,649 |
Minimum |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fixed Interest rate loan | 1.24% | 2.53% |
Fixed rate loan maturities range | 4 months | 1 year |
Maximum |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fixed Interest rate loan | 18.00% | 18.00% |
Fixed rate loan maturities range | 35 years | 30 years |

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