LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finance receivable by credit quality indicator [Abstract]
Loans	$ 1,303,032	$ 1,315,609
Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	433,500	444,641
Pass
Finance receivable by credit quality indicator [Abstract]
Loans	819,236	819,733
Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	20,632	21,282
Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	23,248	26,847
Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	6,416	3,106
Commercial and agricultural
Finance receivable by credit quality indicator [Abstract]
Loans	205,137	203,412
Commercial Mortgages
Finance receivable by credit quality indicator [Abstract]
Loans	660,158	662,988
Commercial Mortgages | Construction
Finance receivable by credit quality indicator [Abstract]
Loans	46,735	54,626
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	46,634	54,517
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	101	109
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	613,423	608,362
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	580,440	574,221
Commercial Mortgages | Commercial mortgages | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	15,928	16,830
Commercial Mortgages | Commercial mortgages | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	12,442	15,948
Commercial Mortgages | Commercial mortgages | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	4,613	1,363
Residential mortgages
Finance receivable by credit quality indicator [Abstract]
Loans	181,940	183,225
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	181,940	183,225
Residential mortgages | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	179,390	180,570
Residential mortgages | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	2,550	2,655
Residential mortgages | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	179,390	180,570
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	2,550	2,655
Residential mortgages | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	0	0
Consumer Loans
Finance receivable by credit quality indicator [Abstract]
Loans	255,797	265,984
Consumer Loans | Credit cards
Finance receivable by credit quality indicator [Abstract]
Loans	0	1,450
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	0	1,450
Consumer Loans | Credit cards | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	0	1,450
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	0	1,450
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	97,381	98,466
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	97,381	98,466
Consumer Loans | Home equity lines and loans | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	96,359	97,283
Consumer Loans | Home equity lines and loans | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	1,022	1,183
Consumer Loans | Home equity lines and loans | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	96,359	97,283
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	1,022	1,183
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	142,755	149,806
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	142,755	149,806
Consumer Loans | Indirect consumer loans | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	142,123	149,113
Consumer Loans | Indirect consumer loans | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	632	693
Consumer Loans | Indirect consumer loans | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	142,123	149,113
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	632	693
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	15,661	16,262
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	15,661	16,262
Consumer Loans | Direct consumer loans | Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	15,628	16,225
Consumer Loans | Direct consumer loans | Non-Performing
Residential and consumer finance receivable [Abstract]
Residential and consumer loans receivable	33	37
Consumer Loans | Direct consumer loans | Not Rated
Finance receivable by credit quality indicator [Abstract]
Loans	15,628	16,225
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	33	37
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	204,810	203,083
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	191,835	190,666
Commercial and industrial | Commercial and agricultural | Special Mention
Finance receivable by credit quality indicator [Abstract]
Loans	4,704	4,452
Commercial and industrial | Commercial and agricultural | Substandard
Finance receivable by credit quality indicator [Abstract]
Loans	6,468	6,222
Commercial and industrial | Commercial and agricultural | Doubtful
Finance receivable by credit quality indicator [Abstract]
Loans	1,803	1,743
Agricultural | Commercial and agricultural
Finance receivable by credit quality indicator [Abstract]
Loans	327	329
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	327	329
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