LOANS - Loans and Allowance for Loan Losses, Broken Down by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	$ 5,089,800		$ 3,774,157	$ 3,719,000
Allowance for Credit Losses	53,565	$ 52,614	38,917	38,356	$ 32,400	$ 30,742
Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	788,598		536,192
Allowance for Credit Losses	8,492	8,972	6,349	5,900	4,511	4,873
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	2,995,803		2,135,263
Allowance for Credit Losses	29,103	28,726	20,389	20,925	18,668	17,552
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,247,568		1,058,999
Allowance for Credit Losses	15,163	14,123	11,599	10,984	8,752	7,889
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	57,831		43,703
Allowance for Credit Losses	807	$ 793	580	$ 547	$ 469	$ 428
Individually evaluated
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	7,713		5,558
Allowance for Credit Losses	307		5
Individually evaluated | Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,081		0
Allowance for Credit Losses	217		0
Individually evaluated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	5,251		4,560
Allowance for Credit Losses	90		0
Individually evaluated | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,366		998
Allowance for Credit Losses	0		5
Individually evaluated | Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	15		0
Allowance for Credit Losses	0		0
Collectively evaluated
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	5,082,087		3,768,599
Allowance for Credit Losses	53,258		38,912
Collectively evaluated | Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	787,517		536,192
Allowance for Credit Losses	8,275		6,349
Collectively evaluated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	2,990,552		2,130,703
Allowance for Credit Losses	29,013		20,389
Collectively evaluated | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,246,202		1,058,001
Allowance for Credit Losses	15,163		11,594
Collectively evaluated | Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	57,816		43,703
Allowance for Credit Losses	$ 807		$ 580