LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Accounted for on a Nonaccrual Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 164,686	$ 151,117
Financing receivable, nonaccrual, no allowance	89,612	86,577
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	16,760	8,059
Financing receivable, nonaccrual, no allowance	4,874	2,049
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	1,306	1,153
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	309	299
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	282	282
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	10,777	11,295
Financing receivable, nonaccrual, no allowance	5,412	9,109
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	135,252	130,029
Financing receivable, nonaccrual, no allowance	79,326	75,419
Real estate – residential | GNMA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 84,200	$ 90,200