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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Risk ratings of loans by categories of loans (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 299,417 | $ 299,120 |  |
Non-accrual | 2,462 | 1,947 | $ 5,441 | $ 3,270
Troubled debt restructures | $ 245 | $ 248 |  |
Number of TDRs accounts | loan | 2 | 2 |  |
Non-performing TDRs | loan | 43 | 44 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 296,229 | $ 297,224 |  |
Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 1,069 |  |
Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 3,070 | 742 |  |
Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 118 | 85 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 12,876 | 13,071 |  |
Non-accrual | 312 | 186 | 151 | 185
Troubled debt restructures | $ 43 | $ 44 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Non-performing TDRs | loan | 43 | 44 |  |
Number of non-performing TDRs accounts | loan | 1 | 1 |  |
Consumer | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 12,564 | $ 12,888 |  |
Consumer | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 312 | 183 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 81,567 | 82,637 |  |
Non-accrual | 1,232 | 956 | 2,290 | 2,124
Residential Real estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 80,397 | 82,111 |  |
Residential Real estate | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 424 |  |
Residential Real estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 1,170 | 102 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 115,800 | 116,698 |  |
Non-accrual | 186 | 116 | 144 | 88
Indirect | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 115,615 | 115,724 |  |
Indirect | Special mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total |  | 645 |  |
Indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 67 | 244 |  |
Indirect | Doubtful |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 118 | 85 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 14,504 | 14,284 |  |
Non-accrual | 86 | 27 | 48 | 48
Troubled debt restructures | $ 202 | $ 204 |  |
Number of TDRs accounts | loan | 1 | 1 |  |
Commercial | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 14,217 | $ 14,284 |  |
Commercial | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 287 |  |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 2,090 | 2,317 |  |
Non-accrual |  |  |  | 318
Construction | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 2,090 | 2,317 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 72,580 | 70,113 |  |
Non-accrual | 646 | 662 | $ 2,490 | $ 507
Commercial Real Estate | Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | 71,346 | 69,900 |  |
Commercial Real Estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total | $ 1,234 | $ 213 |  |

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