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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 16, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Commitments and contingencies          
Contract amount of commitments and contingencies   $ 1,615,899 $ 1,555,901    
Loss contingency accrual, payments     5,800    
Basis points 0.134%        
Uninsured deposits         $ 5,000,000
FDIC expenses   400 1,500    
Litigation accrual     5,800    
Litigation accrual for the year   0      
FDIC insurance expense   2,600   $ 2,100  
Commitments to extend credit          
Commitments and contingencies          
Contract amount of commitments and contingencies   1,550,998 1,494,549    
Standby letters of credit          
Commitments and contingencies          
Contract amount of commitments and contingencies   $ 64,901 $ 61,352