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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2021
Jun. 30, 2025
Jun. 12, 2025
Dec. 31, 2024
Debt Instrument [Line Items]        
Bank par value   $ 13,200    
Weighted average rate percentage   4.52%   4.52%
Amount eligible to borrow from FHLB   $ 1,290,000    
Amount available to borrow from FHLB   1,020,000    
Subordinated debt        
Debt Instrument [Line Items]        
Subordinated debt issued $ 15,000      
Basis spread on prime rate, percentage 3.29%      
Interest rate percentage 4.00%      
Debt Instrument, issuance price, percentage 100.00%      
Trust preferred subordinated debt, FCBI | Subordinated debt        
Debt Instrument [Line Items]        
Subordinated debt issued   $ 6,000    
Basis spread on prime rate, percentage   1.63%    
Interest rate percentage     6.21%