LOAN CREDIT QUALITY AND RELATED ALLOWANCE FOR LOAN LOSSES - Aging Category of Loans, by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Aging categories of loans by segment
Current	$ 1,028,966	$ 895,468
Past Due 30 To 89 Days	8,207	9,053
Past Due 90 Days Or More & Still Accruing	979	387
Non-Accrual	8,467	11,861
Total	1,046,619	916,769
Net deferred loan fees and discounts	(1,412)	(1,190)
Allowance for loan losses	(12,044)	(10,579)	$ (10,144)
Current loans, net	1,015,510	883,699
Loans, net	1,033,163	905,000
Commercial, Financial, and Agricultural
Aging categories of loans by segment
Current	162,312	122,624
Past Due 30 To 89 Days	164	773
Past Due 90 Days Or More & Still Accruing	0	0
Non-Accrual	1,596	759
Total	164,072	124,156
Allowance for loan losses	(1,532)	(1,124)	(474)
Residential Real Estate Mortgages
Aging categories of loans by segment
Current	517,753	450,503
Past Due 30 To 89 Days	6,827	6,078
Past Due 90 Days Or More & Still Accruing	714	332
Non-Accrual	889	847
Total	526,183	457,760
Allowance for loan losses	(5,116)	(3,755)	(3,917)
Commercial Real Estate Mortgage
Aging categories of loans by segment
Current	295,784	279,731
Past Due 30 To 89 Days	720	1,819
Past Due 90 Days Or More & Still Accruing	265	54
Non-Accrual	5,770	9,744
Total	302,539	291,348
Allowance for loan losses	(4,217)	(4,205)	(4,079)
Construction Real Estate Mortgage
Aging categories of loans by segment
Current	26,545	21,485
Past Due 30 To 89 Days	67	0
Past Due 90 Days Or More & Still Accruing	0	0
Non-Accrual	212	511
Total	26,824	21,996
Allowance for loan losses	(160)	(786)	(741)
Installment Loans to Individuals
Aging categories of loans by segment
Current	26,572	21,125
Past Due 30 To 89 Days	429	383
Past Due 90 Days Or More & Still Accruing	0	1
Non-Accrual	0	0
Total	27,001	21,509
Allowance for loan losses	$ (243)	$ (245)	$ (139)