LOANS AND THE ALLOWANCE FOR CREDIT LOSSES - Recorded Investment of Loans, Including Nonaccrual and Restructured Loans, by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Past due loans
Total	$ 1,542,718	$ 1,514,209
Past due	1,346	390
Non-accrual loans
Past due loans
Past due	4,080	1,750
Restructured
Past due loans
Past due	0	0
Purchase credit impaired
Past due loans
Past due	804	819
Commercial, financial and agricultural
Past due loans
Total	276,915	257,078
Past due	623
Municipal
Past due loans
Total	113,875	114,509
Real estate loans - residential
Past due loans
Total	438,424	447,527
Real estate loans - commercial
Past due loans
Total	672,712	636,755
Real estate loans - construction
Past due loans
Total	35,964	52,533
First mortgage
Past due loans
Total		409,936
Past due		235
First mortgage | Real estate loans - residential
Past due loans
Total	402,153	409,936
Past due	121
Second mortgage
Past due loans
Total		37,591
Past due		32
Second mortgage | Real estate loans - residential
Past due loans
Total	36,271	37,591
Owner occupied
Past due loans
Total		226,573
Owner occupied | Real estate loans - commercial
Past due loans
Total	245,110	226,573
Past due	501
Non-owner occupied
Past due loans
Total		410,182
Non-owner occupied | Real estate loans - commercial
Past due loans
Total	427,602	410,182
Residential
Past due loans
Total		2,530
Residential | Real estate loans - construction
Past due loans
Total	2,388	2,530
Commercial
Past due loans
Total		50,003
Commercial | Real estate loans - construction
Past due loans
Total	33,576	50,003
Installment
Past due loans
Total	4,813	5,790
Past due		123
Installment | Real estate loans - construction
Past due loans
Total	4,813
Past due	101
All other loans
Past due loans
Total	15	17
All other loans | Real estate loans - construction
Past due loans
Total	15
31-60 Days Past Due
Past due loans
Past due	1,332	319
31-60 Days Past Due | Commercial, financial and agricultural
Past due loans
Past due	623
31-60 Days Past Due | First mortgage
Past due loans
Past due		164
31-60 Days Past Due | First mortgage | Real estate loans - residential
Past due loans
Past due	121
31-60 Days Past Due | Second mortgage
Past due loans
Past due		32
31-60 Days Past Due | Owner occupied | Real estate loans - commercial
Past due loans
Past due	501
31-60 Days Past Due | Installment
Past due loans
Past due		123
31-60 Days Past Due | Installment | Real estate loans - construction
Past due loans
Past due	87
61-90 Days Past Due
Past due loans
Past due	14	71
61-90 Days Past Due | First mortgage
Past due loans
Past due		71
61-90 Days Past Due | Installment | Real estate loans - construction
Past due loans
Past due	14
91 Days or More Past Due | Accruing loans
Past due loans
Past due	0	19
Current
Past due loans
Total	1,537,160	1,510,637
Current | Commercial, financial and agricultural
Past due loans
Total	276,137	256,894
Current | Municipal
Past due loans
Total	113,875	114,509
Current | First mortgage
Past due loans
Total		408,597
Current | First mortgage | Real estate loans - residential
Past due loans
Total	400,689
Current | Second mortgage
Past due loans
Total		37,559
Current | Second mortgage | Real estate loans - residential
Past due loans
Total	36,271
Current | Owner occupied
Past due loans
Total		224,691
Current | Owner occupied | Real estate loans - commercial
Past due loans
Total	241,895
Current | Non-owner occupied
Past due loans
Total		410,182
Current | Non-owner occupied | Real estate loans - commercial
Past due loans
Total	427,602
Current | Residential
Past due loans
Total		2,530
Current | Residential | Real estate loans - construction
Past due loans
Total	2,388
Current | Commercial
Past due loans
Total		50,003
Current | Commercial | Real estate loans - construction
Past due loans
Total	33,576
Current | Installment
Past due loans
Total		5,655
Current | Installment | Real estate loans - construction
Past due loans
Total	4,712
Current | All other loans
Past due loans
Total		17
Current | All other loans | Real estate loans - construction
Past due loans
Total	15
Nonperforming
Past due loans
Total	4,212	3,182
Nonperforming | Commercial, financial and agricultural
Past due loans
Total	155	184
Nonperforming | First mortgage
Past due loans
Total		1,104
Nonperforming | First mortgage | Real estate loans - residential
Past due loans
Total	1,343
Nonperforming | Owner occupied
Past due loans
Total		1,882
Nonperforming | Owner occupied | Real estate loans - commercial
Past due loans
Total	$ 2,714
Nonperforming | Installment
Past due loans
Total		$ 12