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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Current, past due, and non-accrual loans by categories of loans and restructured loans (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 292,928,000 | $ 295,421,000 |  |
Past Due | 800,000 |  |  |
Non-accrual | 2,462,000 | 1,947,000 | $ 5,441,000 | $ 3,270,000
Total | 299,417,000 | 299,120,000 |  |
30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 4,002,000 | 1,726,000 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
90 Days or More and Still Accruing | 25,000 | 26,000 |  |
Substandard |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total | 3,070,000 | 742,000 |  |
Substandard | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,000,000 |  |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 12,412,000 | 12,669,000 |  |
Non-accrual | 312,000 | 186,000 | 151,000 | 185,000
Total | 12,876,000 | 13,071,000 |  |
Consumer | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 152,000 | 216,000 |  |
Consumer | Substandard |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total | 312,000 | 183,000 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 79,923,000 | 80,923,000 |  |
Non-accrual | 1,232,000 | 956,000 | 2,290,000 | 2,124,000
Total | 81,567,000 | 82,637,000 |  |
Residential Real estate | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 387,000 | 732,000 |  |
Residential Real estate | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
90 Days or More and Still Accruing | 25,000 | 26,000 |  |
Residential Real estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total | 1,170,000 | 102,000 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 114,981,000 | 115,890,000 |  |
Non-accrual | 186,000 | 116,000 | 144,000 | 88,000
Total | 115,800,000 | 116,698,000 |  |
Indirect | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 633,000 | 692,000 |  |
Indirect | Substandard |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total | 67,000 | 244,000 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 14,418,000 | 14,171,000 |  |
Non-accrual | 86,000 | 27,000 | 48,000 | 48,000
Total | 14,504,000 | 14,284,000 |  |
Commercial | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  | 86,000 |  |
Commercial | Substandard |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total | 287,000 |  |  |
Commercial | Substandard | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 202,000 |  |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 2,090,000 | 2,317,000 |  |
Non-accrual |  |  |  | 318,000
Total | 2,090,000 | 2,317,000 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 69,104,000 | 69,451,000 |  |
Non-accrual | 646,000 | 662,000 | $ 2,490,000 | $ 507,000
Total | 72,580,000 | 70,113,000 |  |
Commercial Real Estate | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 2,830,000 |  |  |
Commercial Real Estate | Substandard |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total | 1,234,000 | $ 213,000 |  |
Commercial Real Estate | Substandard | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | $ 583,000 |  |  |

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