LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Accounted for on a Nonaccrual Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 85,266	$ 76,457
Financing receivable, nonaccrual, no allowance	10,376	13,494
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	14,214	9,836
Financing receivable, nonaccrual, no allowance	164	764
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	476	709
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	947	2,831
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	492	5,407
Financing receivable, nonaccrual, no allowance	209	416
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	15,365	18,517
Financing receivable, nonaccrual, no allowance	2,061	7,015
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	53,772	39,157
Financing receivable, nonaccrual, no allowance	$ 7,942	$ 5,299