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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on nonaccrual loans $ 0 $ 0  
Loans, net of unearned income 21,258,374,000   $ 20,739,906,000
Financing receivable, moody's baseline scenario was weighted percentage     75.00%
Financing receivable, moody's upside scenario in weighted percentage     25.00%
Unfunded Loan Commitments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Modified loans 2,000,000.0   $ 179,000
9      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0   0
Loan Receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable $ 76,600,000   $ 77,300,000