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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Risk ratings of loans by categories of loans (Details) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 289,408,000 | $ 271,612,000 |  |
Non-accrual | 4,685,000 | 3,270,000 | $ 3,527,000 | $ 3,751,000
Troubled debt restructures | 256,000 | 263,000 |  |
Troubled debt restructures | $ 256,000 | $ 263,000 |  |
Number of TDRs accounts | loan | 2 | 2 |  |
Non-performing TDRs | loan | 45 | 46 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 282,410,000 | $ 264,969,000 |  |
Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,012,000 | 1,817,000 |  |
Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 5,912,000 | 4,761,000 |  |
Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 74,000 | 65,000 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 14,453,000 | 16,112,000 |  |
Non-accrual | 122,000 | 185,000 | 336,000 | 403,000
Troubled debt restructures | 45,000 |  |  |
Troubled debt restructures | $ 45,000 | $ 46,000 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Non-performing TDRs | loan | 45 | 46 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Consumer | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 14,119,000 | $ 15,823,000 |  |
Consumer | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 187,000 | 77,000 |  |
Consumer | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 146,000 | 188,000 |  |
Consumer | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,000 | 24,000 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 82,144,000 | 81,926,000 |  |
Non-accrual | 1,753,000 | 2,124,000 | 2,331,000 | 2,508,000
Residential Real estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 79,828,000 | 79,060,000 |  |
Residential Real estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 215,000 | 384,000 |  |
Residential Real estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 2,101,000 | 2,482,000 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 101,181,000 | 85,186,000 |  |
Non-accrual | 129,000 | 88,000 | 87,000 | 193,000
Indirect | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 100,143,000 | 83,756,000 |  |
Indirect | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 610,000 | 1,027,000 |  |
Indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 355,000 | 362,000 |  |
Indirect | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 73,000 | 41,000 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 12,028,000 | 11,257,000 |  |
Non-accrual |  | 48,000 |  |
Troubled debt restructures | 211,000 |  |  |
Troubled debt restructures | $ 211,000 | $ 217,000 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Commercial | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 11,817,000 | $ 11,038,000 |  |
Commercial | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 2,000 |  |
Commercial | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 211,000 | 217,000 |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 3,472,000 | 3,536,000 |  |
Non-accrual | 310,000 | 318,000 |  |
Construction | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 3,472,000 | 3,218,000 |  |
Construction | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 318,000 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 76,130,000 | 73,595,000 |  |
Non-accrual | 2,371,000 | 507,000 | $ 773,000 | $ 647,000
Commercial Real Estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 73,031,000 | 72,074,000 |  |
Commercial Real Estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 327,000 |  |
Commercial Real Estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 3,099,000 | $ 1,194,000 |  |

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