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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 30, 2021
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]        
Long-term debt     $ 255,333,000 $ 195,292,000
Maximum borrowings from FHLB     926,500,000  
Available borrowings from FHLB     690,400,000  
FHLB fixed-rate advances maturing year two, amount     $ 80,000,000  
FHLB fixed-rate advances maturing year two, rate     4.71%  
FHLB fixed-rate advances maturing year three, amount     $ 90,000,000 $ 80,000,000
FHLB fixed-rate advances maturing year three, rate     4.55% 4.71%
FHLB fixed-rate advances maturing year four, amount     $ 35,000,000 $ 60,000,000
FHLB fixed-rate advances maturing year four, rate     4.23% 4.64%
FHLB fixed-rate advances maturing year five, amount     $ 30,000,000 $ 35,000,000
FHLB fixed-rate advances maturing year five, rate     4.25% 4.23%
Long-term debt, Rate     4.52% 4.62%
Federal Home Loan Bank Stock     $ 10,600,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged     1,330,000,000  
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%      
Basis spread on prime rate, percentage 3.29%      
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 [1]     $ 5,333,000 $ 5,292,000
Effective rate, percentage     6.25% 7.28%
Basis spread on prime rate, percentage     1.63%  
Subordinated debt issued     $ 6,000,000.0  
Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt | Subsequent Event        
Debt Instrument [Line Items]        
Basis spread on prime rate, percentage   6.25%    
[1] Net of purchase accounting fair value mark.