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Borrowings (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 41,700,000 $ 41,700,000 $ 53,745,000 $ 57,113,000
FHLB Advances          
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 18,000,000 $ 18,000,000 38,716,000  
Weighted average rate percentage   2.67% 2.67%    
Subordinated debt          
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 15,000,000 $ 15,000,000 0  
Interest rate percentage 4.00%        
Subordinated debt issued $ 15,000,000        
Debt Instrument, issuance price, percentage 100.00%        
Loan payable to local bank, 4.5% | Loan payable to local bank          
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 0 $ 0 1,329,000  
Interest rate percentage   4.50% 4.50%    
Period of fixed interest rate     5 years    
Loan payable variable rate, FCBI | Unsecured promissory note          
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 2,700,000 $ 2,700,000 2,700,000  
Interest rate percentage   3.25% 3.25%    
Trust preferred subordinated debt, NWSB | Subordinated debt          
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 0 $ 0 5,000,000  
Interest rate percentage   6.39% 6.39%    
Subordinated debt issued   $ 5,000,000 $ 5,000,000    
Trust preferred subordinated debt, FCBI | Subordinated debt          
Debt Instrument [Line Items]          
Long-term debt outstanding   6,000,000 6,000,000 $ 6,000,000  
Subordinated debt issued   $ 6,000,000 $ 6,000,000    
Trust preferred subordinated debt, FCBI | Subordinated debt | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Interest rate percentage   1.746% 1.746%    
Basis spread on prime rate, percentage   1.63%