LOANS - Summary of Loans Classified as Past Due in Excess of Thirty Days or More and Loans Classified as Non-Accrual (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 3,123,678	$ 2,600,358
PPP Loans	239,700
Total Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	8,931	7,757
Past Due 90 Days Or More and Still Accruing	2,692	2,715
Non- Accrual	24,208	26,740
PCI	9,566	12,095
Total Past Due and Non- Accrual and PCI	45,397	49,307
Total Loans	3,123,678	2,600,358
Total Portfolio [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	1,007	515
Past Due 90 Days Or More and Still Accruing	244	61
Non- Accrual	2,197	2,137
PCI	221	97
Total Past Due and Non- Accrual and PCI	3,669	2,810
Total Loans	561,341	332,600
Total Portfolio [Member] | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	2,116	2,447
Past Due 90 Days Or More and Still Accruing	1,553	1,046
Non- Accrual	19,499	22,441
PCI	3,388	3,844
Total Past Due and Non- Accrual and PCI	26,556	29,778
Total Loans	1,652,993	1,387,207
Total Portfolio [Member] | Lease financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	0	0
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	0	0
PCI	0
Total Past Due and Non- Accrual and PCI	0	0
Total Loans	2,733	3,095
Total Portfolio [Member] | Obligations of states and subdivisions
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	0	0
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	0	0
PCI	0
Total Past Due and Non- Accrual and PCI	0	0
Total Loans	15,369	20,716
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,652,993	1,387,207
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	850,206	814,282
Consumer real estate | Total Portfolio [Member] | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	5,389	4,569
Past Due 90 Days Or More and Still Accruing	895	1,608
Non- Accrual	2,480	1,902
PCI	5,954	8,148
Total Past Due and Non- Accrual and PCI	14,718	16,227
Total Loans	850,206	814,282
Consumer installment | Total Portfolio [Member] | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	419	226
Past Due 90 Days Or More and Still Accruing	0	0
Non- Accrual	32	260
PCI	3	6
Total Past Due and Non- Accrual and PCI	454	492
Total Loans	41,036	42,458
Mortgage loans held for sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 21,432	$ 10,810