LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Class Modified as Troubled Debt Restructurings (Details) - Loans Excluding Purchased Loan $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) contract branch	Jun. 30, 2021 USD ($) contract branch	Jun. 30, 2022 USD ($) contract branch	Jun. 30, 2021 USD ($) contract branch	Dec. 31, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	8	9	15	25
Troubled debt restructurings principal balances	$ 2,298	$ 9,298	$ 3,510	$ 18,368
Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	14	25	37	60
Troubled debt restructurings principal balances	$ 1,073	$ 1,169	$ 3,181	$ 7,195
Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			445		494
Troubled debt restructurings principal balances			$ 36,100		$ 65,582
Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			78		120
Troubled debt restructurings principal balances			$ 5,657		$ 11,006
Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	2	2	6
Troubled debt restructurings principal balances	$ 502	$ 165	$ 502	$ 591
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0	1	3
Troubled debt restructurings principal balances	$ 0	$ 0	$ 357	$ 49
Commercial, financial and agricultural | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			9		12
Troubled debt restructurings principal balances			$ 964		$ 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			$ 364		$ 83
Consumer installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	2	0	2
Troubled debt restructurings principal balances	$ 0	$ 8	$ 0	$ 8
Consumer installment | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0	2	4
Troubled debt restructurings principal balances	$ 0	$ 0	$ 3	$ 5
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			$ 9		$ 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			$ 14		$ 35
Premium finance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2		6	0
Troubled debt restructurings principal balances	$ 756		$ 993	$ 0
Premium finance | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			6
Troubled debt restructurings principal balances			$ 993
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	7	12	22
Troubled debt restructurings principal balances	$ 2	$ 27	$ 22	$ 112
Indirect automobile | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			196		233
Troubled debt restructurings principal balances			$ 759		$ 1,037
Indirect automobile | Financing Receivables, 30 Days Past Due | Non-Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			30		52
Troubled debt restructurings principal balances			$ 122		$ 273
Real estate – construction and development | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	0	0	1
Troubled debt restructurings principal balances	$ 0	$ 0	$ 0	$ 1
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			$ 706		$ 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			0		1
Troubled debt restructurings principal balances			$ 0		$ 13
Real estate – commercial and farmland
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	3	2	5
Troubled debt restructurings principal balances	$ 578	$ 8,653	$ 578	$ 16,312
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	0	1	1	3
Troubled debt restructurings principal balances	$ 0	$ 202	$ 8	$ 5,382
Real estate – commercial and farmland | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			18		25
Troubled debt restructurings principal balances			$ 8,213		$ 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			4		5
Troubled debt restructurings principal balances			$ 788		$ 5,924
Real estate – residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	2	2	5	12
Troubled debt restructurings principal balances	$ 462	$ 472	$ 1,437	$ 1,457
Real estate – residential | Financing Receivables, 30 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract	11	17	21	27
Troubled debt restructurings principal balances	$ 1,071	$ 940	$ 2,791	$ 1,646
Real estate – residential | Financing Receivables, 30 Days Past Due | Accruing Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of contracts | contract			210		213
Troubled debt restructurings principal balances			$ 24,456		$ 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			31		39
Troubled debt restructurings principal balances			$ 4,369		$ 4,678