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LOANS AND ASSET QUALITY - Risk ratings of loans by categories of loans (Details) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) item | Dec. 31, 2016 USD ($) item | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 272,446,000 | $ 266,106,000 |  |
Non-accrual | 3,866,000 | 3,751,000 | $ 2,357,000 | $ 3,706,000
Troubled debt restructures | $ 299,000 | $ 312,000 |  |
Number of TDRs accounts | item | 3 | 3 |  |
Non-performing TDRs | item |  | 84 |  |
Number of non-performing TDRs accounts | item |  | 2 |  |
Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 265,778,000 | $ 256,733,000 |  |
Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,750,000 | 4,698,000 |  |
Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 4,753,000 | 4,461,000 |  |
Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 165,000 | 214,000 |  |
Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 4,044,000 | 4,679,000 |  |
Non-accrual | 48,000 |  |  |
Troubled debt restructures | $ 219,500 | $ 228,000 |  |
Number of TDRs accounts | item | 1,000 | 1 |  |
Commercial and Industrial | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 3,825,000 | $ 4,357,000 |  |
Commercial and Industrial | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 94,000 |  |
Commercial and Industrial | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 219,000 | 228,000 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 68,766,000 | 69,422,000 |  |
Non-accrual | 499,000 | 647,000 | 615,000 | 300,000
Commercial Real Estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 67,124,000 | 64,208,000 |  |
Commercial Real Estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 437,000 | 3,801,000 |  |
Commercial Real Estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,122,000 | 1,413,000 |  |
Commercial Real Estate | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 83,000 |  |  |
Consumer and indirect |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 83,582,000 |  |
Non-accrual | 385,000 | 456,000 |  |
Troubled debt restructures | 32,696 | $ 36,000 |  |
Number of TDRs accounts | item |  | 1 |  |
Non-performing TDRs | item |  | 36 |  |
Number of non-performing TDRs accounts | item |  | 1 |  |
Consumer and indirect | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | $ 82,943,000 |  |
Consumer and indirect | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 276,000 |  |
Consumer and indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 327,000 |  |
Consumer and indirect | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 36,000 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 103,587,000 | 108,423,000 |  |
Non-accrual | 2,934,000 | 2,648,000 | 1,335,000 | 2,575,000
Troubled debt restructures | $ 46,692 | $ 48,000 |  |
Number of TDRs accounts | item | 1,000 | 1 |  |
Non-performing TDRs | item | 47,000 | 48 |  |
Number of non-performing TDRs accounts | item | 1,000 | 1 |  |
Residential Real estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 100,210,000 | $ 105,225,000 |  |
Residential Real estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 479,000 | 527,000 |  |
Residential Real estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 2,898,000 | 2,493,000 |  |
Residential Real estate | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 178,000 |  |
Consumer and Indirect |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 96,049,000 |  |  |
Non-accrual | $ 385,000 | $ 456,000 | $ 407,000 | $ 831,000
Number of TDRs accounts | item | 1,000 |  |  |
Non-performing TDRs | item | 33,000 |  |  |
Number of non-performing TDRs accounts | item | 1,000 |  |  |
Consumer and Indirect | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 94,619,000 |  |  |
Consumer and Indirect | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 834,000 |  |  |
Consumer and Indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 514,000 |  |  |
Consumer and Indirect | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 82,000 |  |  |

X
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