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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Total Allowance by Loan Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 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 | (101,000) | (170,000) | (566,000)
Recoveries | 51,000 |  | 335,000
Provision for loan losses | 360,000 | 195,000 | 336,000
Balance, end of year | 2,899,000 |  | 2,589,000
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 1,061,000 |  | 782,000
Individually evaluated for impairment, Related loan balance | 5,782,000 |  | 3,898,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 1,838,000 |  | 1,807,000
Collectively evaluated for impairment, Related loan balance | 269,934,000 |  | 267,714,000
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 214,000 | 182,000 | 182,000
Charged off | (62,000) |  | (96,000)
Recoveries | 5,000 |  | 8,000
Provision for loan losses | 56,000 |  | 120,000
Balance, end of year | 213,000 |  | 214,000
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 29,000 |  | 52,000
Individually evaluated for impairment, Related loan balance | 99,000 |  | 160,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 184,000 |  | 162,000
Collectively evaluated for impairment, Related loan balance | 15,631,000 |  | 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 |  |  | (3,000)
Recoveries | 2,000 |  | 27,000
Provision for loan losses | (3,000) |  | (5,000)
Balance, end of year | 1,060,000 |  | 1,061,000
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 513,000 |  | 513,000
Individually evaluated for impairment, Related loan balance | 2,323,000 |  | 2,345,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 547,000 |  | 548,000
Collectively evaluated for impairment, Related loan balance | 79,828,000 |  | 79,580,000
Indirect |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 774,000 | 693,000 | 693,000
Charged off | (39,000) |  | (458,000)
Recoveries | 44,000 |  | 286,000
Provision for loan losses | 14,000 |  | 253,000
Balance, end of year | 793,000 |  | 774,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 793,000 |  | 774,000
Collectively evaluated for impairment, Related loan balance | 90,278,000 |  | 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 | 8,000 |  | (38,000)
Balance, end of year | 245,000 |  | 237,000
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 214,000 |  | 217,000
Individually evaluated for impairment, Related loan balance | 214,000 |  | 217,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 31,000 |  | 20,000
Collectively evaluated for impairment, Related loan balance | 10,962,000 |  | 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 | (8,000) |  | 2,000
Balance, end of year | 4,000 |  | 12,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 4,000 |  | 12,000
Collectively evaluated for impairment, Related loan balance | 4,385,000 |  | 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 | 293,000 |  | 18,000
Balance, end of year | 584,000 |  | 291,000
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 305,000 |  |
Individually evaluated for impairment, Related loan balance | 3,146,000 |  | 1,176,000
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 279,000 |  | 291,000
Collectively evaluated for impairment, Related loan balance | $ 68,850,000 |  | 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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