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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Total Allowance by Loan Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | $ 2,589,000 | $ 2,484,000 | $ 2,484,000
Charged off |  |  | (769,000) | (254,000) | (566,000)
Recoveries |  |  | 109,000 |  | 335,000
Provision for loan losses | $ (5,000) | $ (30,000) | 355,000 | 165,000 | 336,000
Balance, end of year | 2,284,000 |  | 2,284,000 |  | 2,589,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 238,000 |  | 238,000 |  | 782,000
Individually evaluated for impairment, Related loan balance | 5,329,000 |  | 5,329,000 |  | 3,898,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 2,046,000 |  | 2,046,000 |  | 1,807,000
Collectively evaluated for impairment, Related loan balance | 284,079,000 |  | 284,079,000 |  | 267,714,000
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 214,000 | 182,000 | 182,000
Charged off |  |  | (92,000) |  | (96,000)
Recoveries |  |  | 12,000 |  | 8,000
Provision for loan losses |  |  | 43,000 |  | 120,000
Balance, end of year | 177,000 |  | 177,000 |  | 214,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 27,000 |  | 27,000 |  | 52,000
Individually evaluated for impairment, Related loan balance | 96,000 |  | 96,000 |  | 160,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 150,000 |  | 150,000 |  | 162,000
Collectively evaluated for impairment, Related loan balance | 14,357,000 |  | 14,357,000 |  | 15,952,000
Residential Real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 1,061,000 | 1,042,000 | 1,042,000
Charged off |  |  | (514,000) |  | (3,000)
Recoveries |  |  | 2,000 |  | 27,000
Provision for loan losses |  |  | 112,000 |  | (5,000)
Balance, end of year | 661,000 |  | 661,000 |  | 1,061,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance |  |  |  |  | 513,000
Individually evaluated for impairment, Related loan balance | 2,006,000 |  | 2,006,000 |  | 2,345,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 661,000 |  | 661,000 |  | 548,000
Collectively evaluated for impairment, Related loan balance | 80,138,000 |  | 80,138,000 |  | 79,580,000
Indirect |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 774,000 | 693,000 | 693,000
Charged off |  |  | (163,000) |  | (458,000)
Recoveries |  |  | 95,000 |  | 286,000
Provision for loan losses |  |  | 93,000 |  | 253,000
Balance, end of year | 799,000 |  | 799,000 |  | 774,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 799,000 |  | 799,000 |  | 774,000
Collectively evaluated for impairment, Related loan balance | 101,181,000 |  | 101,181,000 |  | 85,186,000
Commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 237,000 | 284,000 | 284,000
Charged off |  |  |  |  | (9,000)
Provision for loan losses |  |  | 9,000 |  | (38,000)
Balance, end of year | 246,000 |  | 246,000 |  | 237,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 211,000 |  | 211,000 |  | 217,000
Individually evaluated for impairment, Related loan balance | 211,000 |  | 211,000 |  | 217,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 35,000 |  | 35,000 |  | 20,000
Collectively evaluated for impairment, Related loan balance | 11,817,000 |  | 11,817,000 |  | 11,040,000
Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 12,000 | 10,000 | 10,000
Provision for loan losses |  |  | (1,000) |  | 2,000
Balance, end of year | 11,000 |  | 11,000 |  | 12,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 11,000 |  | 11,000 |  | 12,000
Collectively evaluated for impairment, Related loan balance | 3,472,000 |  | 3,472,000 |  | 3,536,000
Commercial Real Estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 291,000 | 259,000 | 259,000
Recoveries |  |  |  |  | 14,000
Provision for loan losses |  |  | 99,000 |  | 18,000
Balance, end of year | 390,000 |  | 390,000 |  | 291,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Related loan balance | 3,016,000 |  | 3,016,000 |  | 1,176,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 390,000 |  | 390,000 |  | 291,000
Collectively evaluated for impairment, Related loan balance | $ 73,114,000 |  | $ 73,114,000 |  | 72,420,000
Unallocated |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  |  | $ 14,000 | 14,000
Provision for loan losses |  |  |  |  | $ (14,000)

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