LOANS - Schedule of Non-Accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	$ 49,278	$ 62,580
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	37,418	31,461
Real estate – construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	66	9
Real estate – commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	11,128	28,688
Real estate – residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	618	1,881
Installment loans to individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	$ 48	$ 541