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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
 12 Months Ended
Mar. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
FHLB fixed-rate advances maturing within one year of balance sheet date, Amount   $ 80,000,000 $ 0
FHLB fixed-rate advances maturing within one year of balance sheet date, Rate   4.71% 0.00%
Long-term debt   $ 195,292,000 $ 21,000,000
Maximum borrowings from FHLB   867,200,000  
Available borrowings from FHLB   661,700,000  
FHLB fixed-rate advances maturing from one to two years of balance sheet date, Amount   $ 60,000,000 $ 0
FHLB fixed-rate advances maturing from one to two years from balance sheet date, Rate   4.64% 0.00%
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Amount   $ 35,000,000 $ 0
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Rate   4.23% 0.00%
Long-term debt, Rate   4.62% 3.78%
Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Long-term debt   $ 15,000,000 $ 15,000,000
Effective rate, percentage   4.00% 4.00%
Interest rate percentage 4.00%    
Subordinated debt issued $ 15,000,000    
Debt Instrument, Issuance Price, Percentage 100.00%    
Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Long-term debt   $ 5,292,000 $ 6,000,000
Effective rate, percentage   7.28% 3.21%
Subordinated debt issued   $ 6,000,000  
Secured Overnight Financing Rate (SOFR) | Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Basis spread on prime rate, percentage 3.29%    
Secured Overnight Financing Rate (SOFR) | Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt      
Debt Instrument [Line Items]      
Interest rate percentage   7.28%  
Basis spread on prime rate, percentage   1.63%