LOANS - Loans and Allowance for Loan Losses, Broken Down by Portfolio Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	$ 3,124,924		$ 2,959,553
Allowance for Credit Losses	32,400	$ 31,620	30,742	$ 32,457	$ 32,663	$ 35,820
Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	402,619		397,516
Allowance for Credit Losses	4,511	4,874	4,873	3,910	4,158	6,214
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	871,051		838,654
Allowance for Credit Losses	8,752	8,492	7,889	10,339	10,280	4,736
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,810,204		1,683,698
Allowance for Credit Losses	18,668	17,773	17,552	17,573	17,578	24,319
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	41,050		39,685
Allowance for Credit Losses	469	$ 481	428	$ 635	$ 647	$ 551
Individually evaluated
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	2,017		3,570
Allowance for Credit Losses	6		6
Individually evaluated | Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	218		0
Allowance for Credit Losses	0		0
Individually evaluated | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	312		1,858
Allowance for Credit Losses	6		2
Individually evaluated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,487		1,712
Allowance for Credit Losses	0		4
Individually evaluated | Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	0		0
Allowance for Credit Losses	0		0
Collectively evaluated
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	3,122,907		2,955,983
Allowance for Credit Losses	32,394		30,736
Collectively evaluated | Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	402,401		397,516
Allowance for Credit Losses	4,511		4,873
Collectively evaluated | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	870,739		836,796
Allowance for Credit Losses	8,746		7,887
Collectively evaluated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	1,808,717		1,681,986
Allowance for Credit Losses	18,668		17,548
Collectively evaluated | Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
LHFI	41,050		39,685
Allowance for Credit Losses	$ 469		$ 428