LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 20,269,303	$ 19,855,253
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,688,929	2,679,403
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	241,552	384,037
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	34,257	108,648
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	818,728	1,038,924
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	492,668	509,151
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 946,562	$ 1,023,479