LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	$ 14,253	$ 14,260
Charge-offs	(444)	(451)
Recoveries	111	123
Net recoveries (charge-offs)	(333)	(328)
Provision	1,040	595
Ending balance	14,960	14,527
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment			$ 998	$ 876
Collectively evaluated for impairment			13,878	13,293
Total ending allowance balance	14,253	14,260	14,960	14,253
Loans [Abstract]
Loans individually evaluated for impairment			13,440	11,926
Loans collectively evaluated for impairment			1,222,577	1,190,138
Total ending loans balance			1,237,387	1,203,482
Loans acquired with deteriorated credit quality
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	84
Ending balance	84
Ending allowance balance attributable to loans [Abstract]
Total ending allowance balance	84		84	84
Loans [Abstract]
Total ending loans balance			1,370	1,418
Commercial and agricultural:
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	1,589	1,831
Charge-offs	(5)	(8)
Recoveries	24	32
Net recoveries (charge-offs)	19	24
Provision	42	(60)
Ending balance	1,650	1,795
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			1,650	1,589
Total ending allowance balance	1,589	1,831	1,650	1,589
Loans [Abstract]
Loans individually evaluated for impairment			649	693
Loans collectively evaluated for impairment			177,885	176,334
Total ending loans balance			178,534	177,027
Commercial and agricultural: | Loans acquired with deteriorated credit quality
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	0
Ending balance	0
Ending allowance balance attributable to loans [Abstract]
Total ending allowance balance	0		0	0
Loans [Abstract]
Total ending loans balance			0	0
Commercial Mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	7,270	7,112
Charge-offs	0	0
Recoveries	1	7
Net recoveries (charge-offs)	1	7
Provision	478	413
Ending balance	7,749	7,532
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment			845	735
Collectively evaluated for impairment			6,845	6,476
Total ending allowance balance	7,270	7,112	7,749	7,270
Loans [Abstract]
Loans individually evaluated for impairment			11,969	10,382
Loans collectively evaluated for impairment			590,922	558,451
Total ending loans balance			604,166	570,156
Commercial Mortgages | Loans acquired with deteriorated credit quality
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	59
Ending balance	59
Ending allowance balance attributable to loans [Abstract]
Total ending allowance balance	59		59	59
Loans [Abstract]
Total ending loans balance			1,275	1,323
Residential mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	1,523	1,464
Charge-offs	(12)	0
Recoveries	17	0
Net recoveries (charge-offs)	5	0
Provision	(16)	18
Ending balance	1,512	1,482
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			1,487	1,498
Total ending allowance balance	1,523	1,464	1,512	1,523
Loans [Abstract]
Loans individually evaluated for impairment			390	396
Loans collectively evaluated for impairment			198,007	198,474
Total ending loans balance			198,492	198,965
Residential mortgages | Loans acquired with deteriorated credit quality
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	25
Ending balance	25
Ending allowance balance attributable to loans [Abstract]
Total ending allowance balance	25		25	25
Loans [Abstract]
Total ending loans balance			95	95
Consumer Loans
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	3,871	3,853
Charge-offs	(427)	(443)
Recoveries	69	84
Net recoveries (charge-offs)	(358)	(359)
Provision	536	224
Ending balance	4,049	3,718
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment			153	141
Collectively evaluated for impairment			3,896	3,730
Total ending allowance balance	3,871	$ 3,853	4,049	3,871
Loans [Abstract]
Loans individually evaluated for impairment			432	455
Loans collectively evaluated for impairment			255,763	256,879
Total ending loans balance			256,195	257,334
Consumer Loans | Loans acquired with deteriorated credit quality
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance	0
Ending balance	0
Ending allowance balance attributable to loans [Abstract]
Total ending allowance balance	$ 0		0	0
Loans [Abstract]
Total ending loans balance			$ 0	$ 0