LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Classified as Past Due in Excess of Thirty Days or More and Loans Classified as Non-Accrual (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	$ 14,307	$ 7,913
Past Due 90 Days or More and Still Accruing	1,455	1,163
Nonaccrual	12,877	5,980
PCD	3,407	4,710
Total Past Due, Nonaccrual and PCD	32,046	19,766
LHFI	5,318,590	5,170,042
Nonaccrual and PCD with No ACL	2,763	1,555
PPP Loans	256	386
Commercial, financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	2,660	2,043
Past Due 90 Days or More and Still Accruing	527	313
Nonaccrual	667	353
PCD	342	965
Total Past Due, Nonaccrual and PCD	4,196	3,674
LHFI	748,664	800,324
Nonaccrual and PCD with No ACL	270	465
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	3,962	1,698
Past Due 90 Days or More and Still Accruing	0	630
Nonaccrual	8,387	3,790
PCD	456	647
Total Past Due, Nonaccrual and PCD	12,805	6,765
LHFI	3,235,566	3,059,155
Nonaccrual and PCD with No ACL	837	410
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	7,440	3,992
Past Due 90 Days or More and Still Accruing	928	220
Nonaccrual	3,709	1,806
PCD	2,609	3,098
Total Past Due, Nonaccrual and PCD	14,686	9,116
LHFI	1,287,144	1,252,795
Nonaccrual and PCD with No ACL	1,643	680
Consumer installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	245	180
Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	114	31
PCD	0	0
Total Past Due, Nonaccrual and PCD	359	211
LHFI	47,216	57,768
Nonaccrual and PCD with No ACL	$ 13	$ 0