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LOANS AND LEASES - Additional Information (Details)
 9 Months Ended
Sep. 30, 2025
USD ($)
state
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable $ 126,800,000   $ 128,400,000
Discount remaining $ 22,900,000   31,600,000
Number of states, company operating financial services | state 7    
Loan modification, accrued interest receivable $ 80,000.00 $ 70,000.00  
Loan modification, additional funds 0    
Pooled reserves for all other classes of loans $ 1,200,000   3,400,000
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due period for loan to be in default 90 days    
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due period for loan to be in default 12 months    
Total commercial loans and leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified, specific reserves $ 300,000   8,100,000
Loans modified, pooled reserves 1,900,000   1,800,000
Total commercial loans and leases | Commercial loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, collateral dependent 138,700,000    
Threshold for loans whose terms have been modified in a trouble debt restructuring, non accrual 1,000,000.0    
Residential Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value of OREO through foreclosure 900,000   1,200,000
Mortgage loans on real estate, foreclosure $ 14,200,000   $ 10,600,000