LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	$ 21,161	$ 14,253	$ 14,260
Charge Offs	(5,919)	(2,571)	(2,830)
Recoveries	549	457	386
Net (charge offs) recoveries	(5,370)	(2,114)	(2,444)
Provision	3,153	9,022	2,437
Ending balance	18,944	21,161	14,253
Ending allowance balance attributable to loans:
Individually evaluated for impairment				$ 2,189	$ 5,937
Collectively evaluated for impairment				16,755	15,195
Allowance for loan losses	21,161	14,253	14,260	18,944	21,161
Loans:
Loans individually evaluated for impairment				8,731	13,926
Loans collectively evaluated for impairment				1,306,878	1,300,864
Total ending loans balance				1,315,609	1,315,582
Commercial, and Agricultural
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	6,976	1,589	1,831
Charge Offs	(3,644)	(96)	(217)
Recoveries	47	109	92
Net (charge offs) recoveries	(3,597)	13	(125)
Provision	2,004	5,374	(117)
Ending balance	5,383	6,976	1,589
Ending allowance balance attributable to loans:
Individually evaluated for impairment				1,743	5,135
Collectively evaluated for impairment				3,640	1,841
Allowance for loan losses	6,976	1,589	1,831	5,383	6,976
Loans:
Loans individually evaluated for impairment				2,128	6,133
Loans collectively evaluated for impairment				201,284	193,443
Total ending loans balance				203,412	199,576
Commercial mortgages:
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	8,514	7,270	7,112
Charge Offs	(213)	(419)	(911)
Recoveries	3	5	10
Net (charge offs) recoveries	(210)	(414)	(901)
Provision	(120)	1,658	1,059
Ending balance	8,184	8,514	7,270
Ending allowance balance attributable to loans:
Individually evaluated for impairment				446	802
Collectively evaluated for impairment				7,738	7,683
Allowance for loan losses	8,514	7,270	7,112	8,184	8,514
Loans:
Loans individually evaluated for impairment				6,146	7,302
Loans collectively evaluated for impairment				656,842	638,080
Total ending loans balance				662,988	646,174
Residential Mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	1,316	1,523	1,464
Charge Offs	(226)	(225)	(65)
Recoveries	5	30	0
Net (charge offs) recoveries	(221)	(195)	(65)
Provision	131	(12)	124
Ending balance	1,226	1,316	1,523
Ending allowance balance attributable to loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				1,226	1,316
Allowance for loan losses	1,316	1,523	1,464	1,226	1,316
Loans:
Loans individually evaluated for impairment				402	427
Loans collectively evaluated for impairment				182,823	194,510
Total ending loans balance				183,225	194,937
Consumer Loans
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	4,355	3,871	3,853
Charge Offs	(1,836)	(1,831)	(1,637)
Recoveries	494	313	284
Net (charge offs) recoveries	(1,342)	(1,518)	(1,353)
Provision	1,138	2,002	1,371
Ending balance	4,151	4,355	3,871
Ending allowance balance attributable to loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				4,151	4,355
Allowance for loan losses	4,355	3,871	$ 3,853	4,151	4,355
Loans:
Loans individually evaluated for impairment				55	64
Loans collectively evaluated for impairment				265,929	274,831
Total ending loans balance				265,984	274,895
Loans acquired with deteriorated credit quality
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	29
Ending balance	0	29
Ending allowance balance attributable to loans:
Allowance for loan losses	29	29		0	29
Loans:
Total ending loans balance				0	792
Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	0
Ending balance	0	0
Ending allowance balance attributable to loans:
Allowance for loan losses	0	0		0	0
Loans:
Total ending loans balance				0	0
Loans acquired with deteriorated credit quality | Commercial mortgages:
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	29
Ending balance	0	29
Ending allowance balance attributable to loans:
Allowance for loan losses	29	29		0	29
Loans:
Total ending loans balance				0	792
Loans acquired with deteriorated credit quality | Residential Mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	0
Ending balance	0	0
Ending allowance balance attributable to loans:
Allowance for loan losses	0	0		0	0
Loans:
Total ending loans balance				0	0
Loans acquired with deteriorated credit quality | Consumer Loans
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	0
Ending balance	0	0
Ending allowance balance attributable to loans:
Allowance for loan losses	$ 0	$ 0		0	0
Loans:
Total ending loans balance				$ 0	$ 0