LOANS - Purchased Loans (Details) - Purchased Loans - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 818,587	$ 861,595
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	64,612	74,378
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	48,940	65,513
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	465,870	468,246
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	236,453	250,539
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,712	$ 2,919