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	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 3,155,932	$ 2,600,358
Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	15,015	7,757
Past Due 90 Days Or More and Still Accruing	2,396	2,715
Non- Accrual	26,878	26,740
PCI	10,422	12,095
Total Past Due and Non- Accrual and PCI	54,711	49,307
Total Loans	3,155,932	2,600,358
Loans [Member] | Lease financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,478	3,095
Loans [Member] | Obligations of states and subdivisions
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	13,345	20,716
Commercial financial and agriculture | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	815	515
Past Due 90 Days Or More and Still Accruing		61
Non- Accrual	2,737	2,137
PCI	235	97
Total Past Due and Non- Accrual and PCI	3,787	2,810
Total Loans	576,812	332,600
PPP Loans	260,200
Commercial real estate | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	11,123	2,447
Past Due 90 Days Or More and Still Accruing	1,081	1,046
Non- Accrual	21,445	22,441
PCI	3,486	3,844
Total Past Due and Non- Accrual and PCI	37,135	29,778
Total Loans	1,646,325	1,387,207
Consumer real estate | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	2,848	4,569
Past Due 90 Days Or More and Still Accruing	1,306	1,608
Non- Accrual	2,660	1,902
PCI	6,697	8,148
Total Past Due and Non- Accrual and PCI	13,511	16,227
Total Loans	874,640	814,282
Consumer installment | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	229	226
Past Due 90 Days Or More and Still Accruing	9
Non- Accrual	36	260
PCI	4	6
Total Past Due and Non- Accrual and PCI	278	492
Total Loans	$ 42,332	$ 42,458