LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finance receivable by credit quality indicator [Abstract]
Loans	$ 1,338,110	$ 1,315,582
Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	792
Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	470,268	464,414
Pass
Finance receivable by credit quality indicator [Abstract]
Loans	824,182	807,976
Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	20,482	14,112
Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	20,495	25,489
Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	2,683	2,799
Commercial and agricultural:
Finance receivable by credit quality indicator [Abstract]
Loans	194,057	199,576
Commercial and agricultural: | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans		0
Commercial Mortgages
Finance receivable by credit quality indicator [Abstract]
Loans	668,558	646,174
Commercial Mortgages | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans		792
Commercial Mortgages | Construction
Finance receivable by credit quality indicator [Abstract]
Loans	45,671	45,688
Commercial Mortgages | Construction | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial Mortgages | Construction | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial Mortgages | Construction | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	45,548	45,553
Commercial Mortgages | Construction | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial Mortgages | Construction | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	123	135
Commercial Mortgages | Construction | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial Mortgages | Commercial mortgages
Finance receivable by credit quality indicator [Abstract]
Loans	622,887	600,486
Commercial Mortgages | Commercial mortgages | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	792
Commercial Mortgages | Commercial mortgages | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial Mortgages | Commercial mortgages | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	598,395	575,321
Commercial Mortgages | Commercial mortgages | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	10,639	9,665
Commercial Mortgages | Commercial mortgages | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	12,526	13,331
Commercial Mortgages | Commercial mortgages | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	1,327	1,377
Residential mortgages
Finance receivable by credit quality indicator [Abstract]
Loans	193,931	194,937
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	193,931	194,937
Residential mortgages | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Residential mortgages | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	190,950	191,777
Residential mortgages | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	2,981	3,160
Residential mortgages | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	190,776	191,777
Residential mortgages | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Residential mortgages | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Residential mortgages | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	3,155	3,160
Residential mortgages | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans:
Finance receivable by credit quality indicator [Abstract]
Loans	281,564	274,895
Consumer loans: | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans		0
Consumer loans: | Credit cards
Finance receivable by credit quality indicator [Abstract]
Loans	1,368	1,516
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	1,368	1,516
Consumer loans: | Credit cards | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Credit cards | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	1,368	1,516
Consumer loans: | Credit cards | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	0	0
Consumer loans: | Credit cards | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	1,368	1,516
Consumer loans: | Credit cards | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Credit cards | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Credit cards | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Credit cards | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Home equity lines and loans
Finance receivable by credit quality indicator [Abstract]
Loans	99,337	100,878
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	99,337	100,878
Consumer loans: | Home equity lines and loans | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Home equity lines and loans | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	97,978	99,568
Consumer loans: | Home equity lines and loans | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	1,359	1,310
Consumer loans: | Home equity lines and loans | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	97,978	99,568
Consumer loans: | Home equity lines and loans | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Home equity lines and loans | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Home equity lines and loans | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	1,359	1,310
Consumer loans: | Home equity lines and loans | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Indirect consumer loans
Finance receivable by credit quality indicator [Abstract]
Loans	163,206	153,532
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	163,206	153,532
Consumer loans: | Indirect consumer loans | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Indirect consumer loans | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	162,533	152,598
Consumer loans: | Indirect consumer loans | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	673	934
Consumer loans: | Indirect consumer loans | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	162,533	152,598
Consumer loans: | Indirect consumer loans | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Indirect consumer loans | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Indirect consumer loans | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	673	934
Consumer loans: | Indirect consumer loans | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Direct consumer loans
Finance receivable by credit quality indicator [Abstract]
Loans	17,653	18,969
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	17,653	18,969
Consumer loans: | Direct consumer loans | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Direct consumer loans | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	17,613	18,955
Consumer loans: | Direct consumer loans | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	40	14
Consumer loans: | Direct consumer loans | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	17,613	18,955
Consumer loans: | Direct consumer loans | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Direct consumer loans | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer loans: | Direct consumer loans | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	40	14
Consumer loans: | Direct consumer loans | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial and industrial | Commercial and agricultural:
Finance receivable by credit quality indicator [Abstract]
Loans	193,632	199,030
Commercial and industrial | Commercial and agricultural: | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial and industrial | Commercial and agricultural: | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Commercial and industrial | Commercial and agricultural: | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	179,814	186,556
Commercial and industrial | Commercial and agricultural: | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	9,843	4,447
Commercial and industrial | Commercial and agricultural: | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	2,619	6,605
Commercial and industrial | Commercial and agricultural: | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	1,356	1,422
Agricultural | Commercial and agricultural:
Finance receivable by credit quality indicator [Abstract]
Loans	425	546
Agricultural | Commercial and agricultural: | Loans acquired with deteriorated credit quality
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Agricultural | Commercial and agricultural: | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Agricultural | Commercial and agricultural: | Pass
Finance receivable by credit quality indicator [Abstract]
Loans	425	546
Agricultural | Commercial and agricultural: | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Agricultural | Commercial and agricultural: | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Agricultural | Commercial and agricultural: | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	$ 0	$ 0