LOANS AND ASSET QUALITY - Current, past due, and non-accrual loans by categories of loans and restructured loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 267,090	$ 259,529
Past Due		2,790
90 Days or More and Still Accruing	71	36
Non-accrual	3,866	3,751	$ 2,357	$ 3,706
Total	272,446	266,106
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,419
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,989	4,679
Non-accrual	48
Total	4,045	4,679
Commercial and Industrial | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	68,267	68,775
Non-accrual	499	647	615	300
Total	68,766	69,422
Consumer and indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	94,578	82,134
Past Due		992
Non-accrual	385	456
Total	96,048	83,582
Consumer and indirect | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,085
Residential Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	100,256	103,941
Past Due		1,798
90 Days or More and Still Accruing	71	36
Non-accrual	2,934	2,648	$ 1,335	$ 2,575
Total	103,587	$ 108,423
Residential Real estate | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 326