LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Accounted for on a Nonaccrual Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 118,676	$ 85,266
Financing receivable, nonaccrual, no allowance	6,857	10,376
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	10,344	14,214
Financing receivable, nonaccrual, no allowance	0	164
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	412	476
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	393	947
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	168	492
Financing receivable, nonaccrual, no allowance	0	209
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	14,172	15,365
Financing receivable, nonaccrual, no allowance	2,715	2,061
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	93,187	53,772
Financing receivable, nonaccrual, no allowance	$ 4,142	$ 7,942