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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 ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 278,986 | $ 295,421 |  |
Past Due | 700 |  |  |
Non-accrual | 4,229 | 1,947 | $ 4,685 | $ 3,270
Total | 283,889 | 299,120 |  |
30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 652 | 1,726 |  |
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 | 22 | 26 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 12,171 | 12,669 |  |
Non-accrual | 144 | 186 | 122 | 185
Total | 12,369 | 13,071 |  |
Consumer | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 54 | 216 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 79,370 | 80,923 |  |
Non-accrual | 756 | 956 | 1,753 | 2,124
Total | 80,211 | 82,637 |  |
Residential Real estate | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 63 | 732 |  |
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 | 22 | 26 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 105,517 | 115,890 |  |
Non-accrual | 36 | 116 | 129 | 88
Total | 106,088 | 116,698 |  |
Indirect | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 535 | 692 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 11,350 | 14,171 |  |
Non-accrual |  | 27 |  | 48
Total | 11,350 | 14,284 |  |
Commercial | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due |  | 86 |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 3,161 | 2,317 |  |
Non-accrual |  |  |  | 318
Total | 3,161 | 2,317 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 67,417 | 69,451 |  |
Non-accrual | 3,293 | 662 | $ 2,371 | $ 507
Total | $ 70,710 | $ 70,113 |  |

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