IMPAIRED LOANS AND ALLOWANCE FOR LOAN LOSSES - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Loan Losses:
Beginning Balance	$ 26,000	$ 20,725	$ 23,400	$ 19,128
Provision for Loan Losses	680	550	3,385	1,411
Charge-Offs	(1,310)	(296)	(2,416)	(697)
Recoveries	1,031	1,788	2,145	3,018
TDR Valuation Adjustments	(169)	(83)	(282)	(176)
Ending Balance	26,232	22,684	26,232	22,684
Construction and Land Development [Member]
Allowance for Loan Losses:
Beginning Balance	1,574	1,160	1,219	1,151
Provision for Loan Losses	(690)	50	(496)	(125)
Charge-Offs	0	0	0	0
Recoveries	728	25	891	214
TDR Valuation Adjustments	0	(2)	(2)	(7)
Ending Balance	1,612	1,233	1,612	1,233
Commercial Real Estate [Member]
Allowance for Loan Losses:
Beginning Balance	9,923	7,192	9,273	6,756
Provision for Loan Losses	62	1,505	410	2,025
Charge-Offs	(239)	(78)	(341)	(209)
Recoveries	175	169	613	271
TDR Valuation Adjustments	(15)	(55)	(49)	(110)
Ending Balance	9,906	8,733	9,906	8,733
Residential Real Estate [Member]
Allowance for Loan Losses:
Beginning Balance	7,423	8,299	7,483	8,057
Provision for Loan Losses	116	(637)	90	(626)
Charge-Offs	(296)	0	(482)	(135)
Recoveries	39	272	266	669
TDR Valuation Adjustments	(148)	(25)	(223)	(56)
Ending Balance	7,134	7,909	7,134	7,909
Commercial And Financial [Member]
Allowance for Loan Losses:
Beginning Balance	5,460	2,591	3,636	2,042
Provision for Loan Losses	834	(633)	3,036	(524)
Charge-Offs	(333)	(200)	(837)	(255)
Recoveries	28	1,278	154	1,773
TDR Valuation Adjustments	0	0	0	0
Ending Balance	5,989	3,036	5,989	3,036
Consumer [Member]
Allowance for Loan Losses:
Beginning Balance	1,620	1,483	1,789	1,122
Provision for Loan Losses	358	265	345	661
Charge-Offs	(442)	(18)	(756)	(98)
Recoveries	61	44	221	91
TDR Valuation Adjustments	(6)	(1)	(8)	(3)
Ending Balance	$ 1,591	$ 1,773	$ 1,591	$ 1,773