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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
FHLB fixed-rate advances maturing within one year of balance sheet date, Amount $ 22,716,000 $ 20,000,000
FHLB fixed-rate advances maturing within one year of balance sheet date, Rate 2.10% 1.87%
FHLB fixed-rate advances maturing from one to two years of balance sheet date, Amount $ 11,000,000 $ 22,716,000
FHLB fixed-rate advances maturing from one to two years from balance sheet date, Rate 2.69% 2.10%
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Amount $ 5,000,000 $ 11,000,000
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Rate 2.60% 2.69%
FHLB fixed-rate advances maturing from three to four years from balance sheet date, Amount   $ 5,000,000
FHLB fixed-rate advances maturing from three to four years from balance sheet date, Rate   2.60%
Long-term debt $ 53,745,000 $ 66,296,000
Long-term debt, Rate 2.76% 2.58%
Maximum borrowings from FHLB $ 847,881,000  
Available borrowings from FHLB 791,915,000  
Loan payable to local bank, 4.5% | Loan payable to local bank    
Debt Instrument [Line Items]    
Long-term debt $ 1,329,000 $ 1,830,000
Effective rate, percentage 5.51% 4.50%
Contractual rate 4.50%  
Period of fixed interest rate 5 years  
Loan payable to local bank, 5.25% | Loan payable to local bank    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 750,000
Loan payable variable rate, FCBI | Unsecured Debt    
Debt Instrument [Line Items]    
Long-term debt $ 2,700,000 $ 0
Effective rate, percentage 3.22% 0.00%
Contractual rate 3.25%  
Trust Preferred Subordinated Debt, NWSB | Trust preferred subordinated debt    
Debt Instrument [Line Items]    
Long-term debt $ 5,000,000 $ 5,000,000
Effective rate, percentage 6.39% 6.39%
Contractual rate 6.39%  
Trust preferred subordinated debt issued $ 5,000,000  
Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt    
Debt Instrument [Line Items]    
Long-term debt $ 6,000,000 $ 0
Effective rate, percentage 1.69% 0.00%
Trust preferred subordinated debt issued $ 6,000,000  
Wall Street Journal Prime Rate | Loan payable to local bank, 5.25% | Loan payable to local bank    
Debt Instrument [Line Items]    
Effective rate, percentage 0.00% 4.50%
Basis spread on prime rate, percentage 0.25%  
London Interbank Offered Rate (LIBOR) | Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt    
Debt Instrument [Line Items]    
Contractual rate 1.94338%  
Basis spread on prime rate, percentage 1.63%