LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Class Modified as Troubled Debt Restructurings (Details) - Loans Excluding Purchased Loan $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) contract branch	Sep. 30, 2021 USD ($) branch contract	Sep. 30, 2022 USD ($) contract branch	Sep. 30, 2021 USD ($) contract branch	Dec. 31, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	5	9	17	34
Troubled debt restructurings principal balances	$ 759	$ 1,818	$ 2,830	$ 20,066
Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	18	10	37	33
Troubled debt restructurings principal balances	$ 1,442	$ 514	$ 3,210	$ 1,189
Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			412		494
Troubled debt restructurings principal balances			$ 35,703		$ 65,582
Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			71		120
Troubled debt restructurings principal balances			$ 4,050		$ 11,006
Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	0	3	6
Troubled debt restructurings principal balances	$ 450	$ 0	$ 916	$ 532
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	1	1	1
Troubled debt restructurings principal balances	$ 0	$ 1	$ 348	$ 1
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			8		12
Troubled debt restructurings principal balances			$ 1,342		$ 1,286
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			3		6
Troubled debt restructurings principal balances			$ 353		$ 83
Consumer installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0	0	2
Troubled debt restructurings principal balances	$ 0	$ 0	$ 0	$ 7
Consumer installment | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	1	2	1
Troubled debt restructurings principal balances	$ 0	$ 1	$ 2	$ 1
Consumer installment | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			4		7
Troubled debt restructurings principal balances			$ 6		$ 16
Consumer installment | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			10		17
Troubled debt restructurings principal balances			$ 12		$ 35
Premium finance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0	5	0
Troubled debt restructurings principal balances	$ 0	$ 0	$ 456	$ 0
Premium finance | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			5
Troubled debt restructurings principal balances			$ 456
Premium finance | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			0
Troubled debt restructurings principal balances			$ 0
Indirect automobile | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | branch	3	4	9	16
Troubled debt restructurings principal balances	$ 20	$ 23	$ 27	$ 76
Indirect automobile | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			170		233
Troubled debt restructurings principal balances			$ 595		$ 1,037
Indirect automobile | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			25		52
Troubled debt restructurings principal balances			$ 101		$ 273
Real estate – construction and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			1	0
Troubled debt restructurings principal balances			$ 24	$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	0	1	0
Troubled debt restructurings principal balances	$ 24	$ 0	$ 24	$ 0
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			2		4
Troubled debt restructurings principal balances			$ 698		$ 789
Real estate – construction and development | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			1		1
Troubled debt restructurings principal balances			$ 24		$ 13
Real estate – commercial and farmland
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	1	0	2	5
Troubled debt restructurings principal balances	$ 17	$ 0	$ 99	$ 16,257
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0	1	0
Troubled debt restructurings principal balances	$ 0	$ 0	$ 8	$ 0
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			17		25
Troubled debt restructurings principal balances			$ 8,091		$ 35,575
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			3		5
Troubled debt restructurings principal balances			$ 66		$ 5,924
Real estate – residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	9	6	21
Troubled debt restructurings principal balances	$ 268	$ 1,818	$ 1,335	$ 3,270
Real estate – residential | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	14	4	23	15
Troubled debt restructurings principal balances	$ 1,398	$ 489	$ 2,801	$ 1,111
Real estate – residential | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			206		213
Troubled debt restructurings principal balances			$ 24,515		$ 26,879
Real estate – residential | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			29		39
Troubled debt restructurings principal balances			$ 3,494		$ 4,678