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LOANS (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Loans and Leases [Line Items]        
Accrued interest receivable $ 66,400,000   $ 65,400,000  
Total Loans 11,644,641,000   12,068,645,000  
Allowance for credit losses 123,934,000 $ 112,707,000 $ 122,566,000 $ 109,483,000
Loans secured by residential real estate property in process of foreclosure $ 189,000      
Loans delinquent 30 to 89 days, percentage 0.31%   0.09%  
Interest income on nonaccrual loans $ 0 $ 0    
Nonaccrual loans with no related allowance 51,100,000   $ 52,500,000  
Unfunded commitments 0      
Paycheck Protection Program ("PPP")        
Loans and Leases [Line Items]        
Allowance for credit losses 0      
Paycheck Protection Program ("PPP") | Nonpass        
Loans and Leases [Line Items]        
Total Loans $ 254,000   $ 136,000,000