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LOANS (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Loans and Leases [Line Items]                
Accrued interest receivable $ 60,100,000   $ 60,100,000     $ 65,400,000    
Unfunded commitments 0   0          
Total Loans 11,440,917,000   11,440,917,000     12,068,645,000    
Allowance for credit losses 106,797,000 $ 110,208,000 106,797,000 $ 110,208,000 $ 126,861,000 $ 122,566,000 $ 111,198,000 $ 109,483,000
Loans secured by residential real estate property in process of foreclosure $ 918,000   $ 918,000          
Loans delinquent 30 to 89 days, percentage 0.26%   0.26%     0.09%    
Interest income on nonaccrual loans $ 0 $ 0 $ 0 $ 0        
Nonaccrual loans with no related allowance 28,700,000   28,700,000     $ 52,500,000    
Paycheck Protection Program ("PPP")                
Loans and Leases [Line Items]                
Allowance for credit losses 0   0          
Paycheck Protection Program ("PPP") | Nonpass                
Loans and Leases [Line Items]                
Total Loans $ 158,000   $ 158,000     $ 136,000,000