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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Risk ratings of loans by categories of loans (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 275,716,000 | $ 271,612,000 |  |
Non-accrual | 5,441,000 | 3,270,000 | $ 3,772,000 | $ 3,751,000
Troubled debt restructures | 260,000 | 263,000 |  |
Troubled debt restructures | $ 260,000 | $ 263,000 |  |
Number of TDRs accounts | loan | 2 | 2 |  |
Non-performing TDRs | loan | 46 | 46 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 273,763,000 | $ 269,217,000 |  |
Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,200,000 | 1,776,000 |  |
Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 657,000 | 554,000 |  |
Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 96,000 | 65,000 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 15,730,000 | 16,112,000 |  |
Non-accrual | 151,000 | 185,000 | 395,000 | 403,000
Troubled debt restructures | 46,000 |  |  |
Troubled debt restructures | $ 46,000 | $ 46,000 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Non-performing TDRs | loan | 46 | 46 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Consumer | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 15,574,000 | $ 16,008,000 |  |
Consumer | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 97,000 | 77,000 |  |
Consumer | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 14,000 | 3,000 |  |
Consumer | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 45,000 | 24,000 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 82,151,000 | 81,926,000 |  |
Non-accrual | 2,290,000 | 2,124,000 | 2,342,000 | 2,508,000
Residential Real estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 81,612,000 | 81,346,000 |  |
Residential Real estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 217,000 | 344,000 |  |
Residential Real estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 322,000 | 236,000 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 90,278,000 | 85,186,000 |  |
Non-accrual | 144,000 | 88,000 | 180,000 | 193,000
Indirect | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 89,345,000 | 83,803,000 |  |
Indirect | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 561,000 | 1,027,000 |  |
Indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 321,000 | 315,000 |  |
Indirect | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 51,000 | 41,000 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 11,176,000 | 11,257,000 |  |
Non-accrual | 48,000 | 48,000 |  |
Troubled debt restructures | 214,000 |  |  |
Troubled debt restructures | $ 214,000 | $ 217,000 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Commercial | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 11,175,000 | $ 11,256,000 |  |
Commercial | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,000 | 1,000 |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 4,385,000 | 3,536,000 |  |
Non-accrual | 318,000 | 318,000 | 170,000 |
Construction | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 4,385,000 | 3,536,000 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 71,996,000 | 73,595,000 |  |
Non-accrual | 2,490,000 | 507,000 | $ 685,000 | $ 647,000
Commercial Real Estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 71,672,000 | 73,268,000 |  |
Commercial Real Estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 324,000 | $ 327,000 |  |

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