LOANS AND THE ALLOWANCE FOR CREDIT LOSSES - Loan Loss Experience and Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Loan loss experience and activity in allowance for loan losses
Beginning balance	$ 12,659	$ 12,040
Charge-offs	(72)	(118)
Recoveries	34	36
Provision (credit)	566	215
Ending balance	13,187	12,173
Commercial, financial and agricultural
Loan loss experience and activity in allowance for loan losses
Beginning balance	2,946	2,696
Charge-offs	(3)	(3)
Recoveries	2	2
Provision (credit)	250	161
Ending balance	3,195	2,856
Municipal
Loan loss experience and activity in allowance for loan losses
Beginning balance	593	590
Provision (credit)	(19)	32
Ending balance	574	622
Real estate loans - residential
Loan loss experience and activity in allowance for loan losses
Beginning balance	2,575	2,882
Charge-offs		(73)
Recoveries	9	11
Provision (credit)	(32)	37
Ending balance	2,552	2,857
Real estate loans - commercial
Loan loss experience and activity in allowance for loan losses
Beginning balance	5,922	5,386
Recoveries		4
Provision (credit)	434	(109)
Ending balance	6,356	5,281
Real estate loans - construction
Loan loss experience and activity in allowance for loan losses
Beginning balance	534	420
Provision (credit)	(183)	45
Ending balance	351	465
Installment
Loan loss experience and activity in allowance for loan losses
Beginning balance	89	66
Charge-offs	(69)	(42)
Recoveries	23	19
Provision (credit)	116	49
Ending balance	$ 159	$ 92