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Federal Home Loan Bank Advances and Other Borrowings - Additional Information (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Available federal funds lines of credit $ 35,000,000.0  
Residential One-to-four Unit Single Family [Member]    
Line of Credit Facility [Line Items]    
Credit available as a percent of qualifying collateral 100.00%  
Commercial Real Estate [Member]    
Line of Credit Facility [Line Items]    
Credit available as a percent of qualifying collateral 70.00%  
Minimum [Member] | Home Equity Lines of Credit [Member]    
Line of Credit Facility [Line Items]    
Credit available as a percent of qualifying collateral 68.00%  
Maximum [Member] | Home Equity Lines of Credit [Member]    
Line of Credit Facility [Line Items]    
Credit available as a percent of qualifying collateral 84.00%  
Federal Home Loan Bank Advances [Member]    
Line of Credit Facility [Line Items]    
FHLB outstanding includes amortizing balance $ 12,600,000 $ 16,700,000
Interest rate 2.06%  
Maximum borrowing limit $ 109,100,000  
Federal Home Loan Bank Advances [Member] | Weighted Average [Member]    
Line of Credit Facility [Line Items]    
Interest rate 2.06% 2.21%
Line of Credit with Commercial Banks [Member]    
Line of Credit Facility [Line Items]    
Available federal funds lines of credit $ 96,000,000.0  
Federal funds lines of credit in use 0  
Federal Reserve Bank of Richmond [Member]    
Line of Credit Facility [Line Items]    
Available federal funds lines of credit $ 22,600,000