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	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 3,036,732	$ 3,123,678
PPP Loans	157,800	239,700
Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	5,720	8,931
Past Due 90 Days Or More and Still Accruing	5,834	2,692
Non- Accrual	20,098	24,208
PCD	7,527
PCI		9,566
Total Past Due and Non- Accrual and PCD	39,179	45,397
Total Loans	3,036,732	3,123,678
Nonaccrual with No ACL	3,702
Commercial financial and agriculture | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days		1,007
Past Due 90 Days Or More and Still Accruing		244
Non- Accrual		2,197
PCI		221
Total Past Due and Non- Accrual and PCD		3,669
Total Loans		579,443
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,653,090	1,652,993
Commercial real estate | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days		2,116
Past Due 90 Days Or More and Still Accruing		1,553
Non- Accrual		19,499
PCI		3,388
Total Past Due and Non- Accrual and PCD		26,556
Total Loans		1,652,993
Consumer real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	833,889	850,206
Consumer real estate | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days		5,389
Past Due 90 Days Or More and Still Accruing		895
Non- Accrual		2,480
PCI		5,954
Total Past Due and Non- Accrual and PCD		14,718
Total Loans		850,206
Consumer installment | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days		419
Non- Accrual		32
PCI		3
Total Past Due and Non- Accrual and PCD		454
Total Loans		$ 41,036
Commercial financial and agriculture | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	252
Past Due 90 Days Or More and Still Accruing	10
Non- Accrual	276
PCD	28
Total Past Due and Non- Accrual and PCD	566
Total Loans	511,517
Nonaccrual with No ACL	28
Commercial real estate | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	2,318
Past Due 90 Days Or More and Still Accruing	4,913
Non- Accrual	16,601
PCD	2,470
Total Past Due and Non- Accrual and PCD	26,302
Total Loans	1,653,090
Nonaccrual with No ACL	1,841
Consumer real estate | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	3,020
Past Due 90 Days Or More and Still Accruing	911
Non- Accrual	3,185
PCD	5,027
Total Past Due and Non- Accrual and PCD	12,143
Total Loans	833,889
Nonaccrual with No ACL	1,833
Consumer installment | Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due 30 to 89 Days	130
Non- Accrual	36
PCD	2
Total Past Due and Non- Accrual and PCD	168
Total Loans	$ 38,236