LOANS - Modifications of Loans Performing (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	$ 5,010,925,000	$ 3,774,157,000
Past Due 90 Days or More and Still Accruing	0	289,000
Nonaccrual	12,759,000	10,430,000
Total		21,751,000
Allowance for TDRs		841,000
Financing receivable, total		841,000
Commercial, financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	790,295,000	536,192,000
Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	221,000	19,000
Total		49,000
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	2,915,886,000	2,135,263,000
Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	9,196,000	7,445,000
Total		19,682,000
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,249,295,000	1,058,999,000
Past Due 90 Days or More and Still Accruing	0	289,000
Nonaccrual	3,324,000	2,965,000
Total		2,006,000
Consumer installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	55,449,000	43,703,000
Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	18,000	1,000
Total		14,000
Financial Asset, Not Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment		14,701,000
Allowance for TDRs		350,000
Financial Asset, Not Past Due | Commercial, financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment		49,000
Financial Asset, Not Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment		13,561,000
Financial Asset, Not Past Due | Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment		1,077,000
Financial Asset, Not Past Due | Consumer installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment		14,000
Financial Asset, Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	$ 0	0
Past Due 30-89		0
Past Due 90 Days or More and Still Accruing		0
Nonaccrual		7,050,000
Financing receivable allowance for credit losses current nonaccrual status		491,000
Financial Asset, Past Due | Commercial, financial and agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30-89		0
Past Due 90 Days or More and Still Accruing		0
Nonaccrual		0
Financial Asset, Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30-89		0
Past Due 90 Days or More and Still Accruing		0
Nonaccrual		6,121,000
Financial Asset, Past Due | Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30-89		0
Past Due 90 Days or More and Still Accruing		0
Nonaccrual		929,000
Financial Asset, Past Due | Consumer installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30-89		0
Past Due 90 Days or More and Still Accruing		0
Nonaccrual		$ 0