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Off-Balance Sheet Activities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Small Business Investment Corporations |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | $ 5,831 | $ 3,905
Low Income Housing Partnerships |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | 4,190 | 1,434
Capital Contributions, Small Business Investment Corporation |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | 9,669 | 6,595
Capital Contributions, Low Income Housing Partnerships |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | $ 4,810 | $ 4,566
Minimum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Interest rate loan | 2.53% | 2.45%
Fixed rate loan maturities range | 1 year | 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 | 30 years | 35 years

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