LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Accounted for on a Nonaccrual Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 126,680	$ 134,808
Financing receivable, nonaccrual, no allowance	70,914	60,231
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	8,774	11,094
Financing receivable, nonaccrual, no allowance	1,344	33
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	235	420
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	318	346
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	447	523
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	10,657	13,203
Financing receivable, nonaccrual, no allowance	7,997	1,464
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	106,249	109,222
Financing receivable, nonaccrual, no allowance	61,573	58,734
Real estate – residential | GNMA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 69,700	$ 69,600