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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
 12 Months Ended
Mar. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
FHLB fixed-rate advances maturing within one year of balance sheet date, Amount   $ 0 $ 22,716,000
FHLB fixed-rate advances maturing within one year of balance sheet date, Rate   0.00% 2.10%
FHLB fixed-rate advances maturing from one to two years of balance sheet date, Amount   $ 11,000,000 $ 11,000,000
FHLB fixed-rate advances maturing from one to two years from balance sheet date, Rate   2.69% 2.69%
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Amount   $ 0 $ 5,000,000
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Rate   0.00% 2.60%
Long-term debt   $ 34,700,000 $ 53,745,000
Long-term debt, Rate   2.69% 2.76%
Maximum borrowings from FHLB   $ 793,135,000  
Available borrowings from FHLB   762,885,000  
Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Long-term debt   $ 15,000,000 $ 0
Effective rate, percentage   4.00% 0.00%
Contractual rate 4.00%    
Trust preferred 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   $ 0 $ 1,329,000
Effective rate, percentage   0.00% 5.51%
Contractual rate   4.50%  
Period of fixed interest rate   5 years  
Loan payable variable rate, FCBI | Unsecured Debt      
Debt Instrument [Line Items]      
Long-term debt   $ 2,700,000 $ 2,700,000
Effective rate, percentage   3.32% 3.22%
Contractual rate   3.25%  
Trust Preferred Subordinated Debt, NWSB | Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Long-term debt   $ 0 $ 5,000,000
Effective rate, percentage   0.00% 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 $ 6,000,000
Effective rate, percentage   0.00% 1.69%
Trust preferred subordinated debt issued   $ 6,000,000  
London Interbank Offered Rate (LIBOR) | Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Contractual rate   1.83275%  
Basis spread on prime rate, percentage   1.63%