LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans and Allowance for Loan Losses, Broken Down by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	$ 5,318,590		$ 5,170,042
Allowance for Credit Losses	55,700	$ 55,133	54,032	$ 53,565	$ 52,614	$ 38,917
Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	748,664		800,324
Allowance for Credit Losses	8,908	8,731	8,844	8,492	8,972	6,349
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	3,235,566		3,059,155
Allowance for Credit Losses	30,684	30,101	29,125	29,103	28,726	20,389
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,287,144		1,252,795
Allowance for Credit Losses	15,434	15,560	15,260	15,163	14,123	11,599
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	47,216		57,768
Allowance for Credit Losses	674	$ 741	803	$ 807	$ 793	$ 580
Individually evaluated
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	3,084		2,902
Allowance for Credit Losses	190		408
Individually evaluated | Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	471		1,414
Allowance for Credit Losses	190		408
Individually evaluated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	838		710
Allowance for Credit Losses	0		0
Individually evaluated | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,762		778
Allowance for Credit Losses	0		0
Individually evaluated | Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	13		0
Allowance for Credit Losses	0		0
Collectively evaluated
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	5,315,506		5,167,140
Allowance for Credit Losses	55,510		53,624
Collectively evaluated | Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	748,193		798,910
Allowance for Credit Losses	8,718		8,436
Collectively evaluated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	3,234,728		3,058,445
Allowance for Credit Losses	30,684		29,125
Collectively evaluated | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,285,382		1,252,017
Allowance for Credit Losses	15,434		15,260
Collectively evaluated | Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	47,203		57,768
Allowance for Credit Losses	$ 674		$ 803