LOANS - Summary of Information Pertaining to Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 117,422	$ 123,082
Allowance for Credit Losses	24,364	24,656
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	5,375	5,490
Allowance for Credit Losses	1,777	2,252
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	1,577	3,523
Allowance for Credit Losses	11	0
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	4,109	4,173
Allowance for Credit Losses	619	512
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	93,689	100,180
Allowance for Credit Losses	20,378	21,001
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	12,672	9,716
Allowance for Credit Losses	$ 1,579	$ 891