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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2021
Mar. 31, 2024
Mar. 15, 2024
Debt Instrument [Line Items]      
Bank par value   $ 10,600  
Bank lines of credit   $ 192,000  
Weighted average rate percentage   4.52%  
Amount eligible to borrow from FHLB   $ 883,200  
Amount available to borrow from FHLB   647,100  
Subordinated debt      
Debt Instrument [Line Items]      
Subordinated debt issued $ 15,000    
Interest rate percentage 4.00%    
Debt Instrument, issuance price, percentage 100.00%    
Subordinated debt | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Basis spread on prime rate, percentage 3.29%    
Trust preferred subordinated debt, FCBI | Subordinated debt      
Debt Instrument [Line Items]      
Subordinated debt issued   $ 6,000  
Trust preferred subordinated debt, FCBI | Subordinated debt | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Basis spread on prime rate, percentage   1.63%  
Interest rate percentage     7.22%