LOANS - Summary 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, 2023	Dec. 31, 2022	Sep. 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	$ 5,020	$ 5,763
Past Due 90 Days or More and Still Accruing	53	289
Nonaccrual	12,489	10,430
PCD	4,934	2,161
Total Past Due, Nonaccrual and PCD	22,496	18,643
LHFI	5,089,800	3,774,157	$ 3,719,000
Nonaccrual and PCD with No ACL	7,274	5,351
PPP Loans	450	710
Commercial, financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	909	220
Past Due 90 Days or More and Still Accruing	32	0
Nonaccrual	315	19
PCD	1,020	0
Total Past Due, Nonaccrual and PCD	2,276	239
LHFI	788,598	536,192
Nonaccrual and PCD with No ACL	830	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	1,279	1,984
Past Due 90 Days or More and Still Accruing	21	0
Nonaccrual	8,985	7,445
PCD	705	1,129
Total Past Due, Nonaccrual and PCD	10,990	10,558
LHFI	2,995,803	2,135,263
Nonaccrual and PCD with No ACL	5,063	4,560
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	2,706	3,386
Past Due 90 Days or More and Still Accruing	0	289
Nonaccrual	3,135	2,965
PCD	3,209	1,032
Total Past Due, Nonaccrual and PCD	9,050	7,672
LHFI	1,247,568	1,058,999
Nonaccrual and PCD with No ACL	1,366	791
Consumer installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	126	173
Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	54	1
PCD	0	0
Total Past Due, Nonaccrual and PCD	180	174
LHFI	57,831	43,703
Nonaccrual and PCD with No ACL	$ 15	$ 0