LOANS - Composition of Loan Portfolio (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 4,443,000	$ 7,678,000
Loans held for investment	3,774,157,000	2,959,553,000
Less allowance for credit losses	(38,917,000)	(30,742,000)	$ (35,820,000)
Net LHFI	3,735,240,000	2,928,811,000
PPP loans	710,000	41,100,000
Mortgage loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	4,443,000	7,678,000
Commercial, financial and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	536,192,000	397,516,000
Less allowance for credit losses	(6,349,000)	(4,873,000)	(6,214,000)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,135,263,000	1,683,698,000
Less allowance for credit losses	(20,389,000)	(17,552,000)	(24,319,000)
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,058,999,000	838,654,000
Less allowance for credit losses	(11,599,000)	(7,889,000)	(4,736,000)
Consumer installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	43,703,000	39,685,000
Less allowance for credit losses	$ (580,000)	$ (428,000)	$ (551,000)