LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income on nonaccrual loans	$ 0	$ 0
Loans, net of unearned income	20,201,079		$ 19,855,253
Unfunded commitments	10,535
Unfunded Loan Commitments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	480
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	$ 74,300		$ 69,300