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Off-Balance Sheet Activities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Small Business Investment Corporations |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | $ 3,905 | $ 3,500
Low Income Housing Partnerships |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | 1,434 | 2,468
Capital Contributions, Small Business Investment Corporation |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | 6,595 | 4,500
Capital Contributions, Low Income Housing Partnerships |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Capital contributions | $ 4,566 | $ 3,532
Minimum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Interest rate loan | 2.45% | 1.00%
Fixed rate loan maturities range | 1 year | 8 months
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 | 35 years

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