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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