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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of recorded investment amount and related allowance for losses of impaired loans (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) borrower loan | Mar. 31, 2017 borrower | Dec. 31, 2017 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding included in current and 30 - 89 days past due | $ 1.0 |  |
Number of borrowers | borrower | 7 | 11 |
Impaired loans with specific reserves: |  |  |
Recorded Investment | $ 3,608,000 |  | $ 1,671,000
Principal Balance | 3,608,000 |  | 1,699,000
Recorded Investment | 4,761,000 |  | 1,740,000
Impaired loans with no specific reserve: |  |  |
Recorded Investment | 2,595,000 |  | 2,643,000
Principal Balance | 3,331,000 |  | 3,411,000
Recorded Investment | 3,468,000 |  | 3,528,000
Home Equity |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding included in current and 30 - 89 days past due | $ 160,000 |  |
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of loans | loan | 2 |  |
Amount of consumer and indirect loans, outstanding | $ 99,500 |  |
Amount of consumer and indirect loans, specific reserves | $ 29,278 |  |
Number of borrowers | borrower | 2 |  |
Impaired loans with specific reserves: |  |  |
Recorded Investment | $ 100,000 |  | 160,000
Principal Balance | 100,000 |  | 160,000
Recorded Investment | $ 137,000 |  | 205,000
Impaired loans with no specific reserve: |  |  |
Recorded Investment |  |  | 49,000
Principal Balance |  |  | 49,000
Residential Real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of loans | loan | 1 |  |
Amount of consumer and indirect loans, outstanding | $ 1,300,000 |  |
Amount of consumer and indirect loans, specific reserves | $ 513,000 |  |
Number of borrowers | borrower | 1 |  |
Impaired loans with specific reserves: |  |  |
Recorded Investment | $ 1,294,000 |  | 1,294,000
Principal Balance | 1,294,000 |  | 1,322,000
Recorded Investment | 1,306,000 |  | 1,312,000
Impaired loans with no specific reserve: |  |  |
Recorded Investment | 977,000 |  | 992,000
Principal Balance | 1,403,000 |  | 1,760,000
Recorded Investment | 1,566,000 |  | 1,572,000
Indirect |  |  |
Impaired loans with specific reserves: |  |  |
Specific Reserve | 832,000 |  |
Impaired loans with no specific reserve: |  |  |
Recorded Investment | 144,000 |  | 88,000
Principal Balance | 144,000 |  | 88,000
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding included in current and 30 - 89 days past due | $ 214,000 |  |
Number of loans | loan | 1 |  |
Amount of consumer and indirect loans, outstanding | $ 214,000 |  |
Amount of consumer and indirect loans, specific reserves | $ 214,000 |  |
Number of borrowers | borrower | 1 |  |
Impaired loans with specific reserves: |  |  |
Recorded Investment | $ 214,000 |  | 217,000
Principal Balance | 214,000 |  | 217,000
Specific Reserve | 214,000 |  |
Recorded Investment | 215,000 |  | 223,000
Impaired loans with no specific reserve: |  |  |
Recorded Investment |  |  | 2,000
Principal Balance |  |  | 2,000
Recorded Investment |  |  | 2,000
Construction |  |  |
Impaired loans with no specific reserve: |  |  |
Recorded Investment | 236,000 |  | 318,000
Principal Balance | 236,000 |  | 318,000
Recorded Investment | 236,000 |  | 322,000
Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding included in current and 30 - 89 days past due | $ 667,000 |  |
Number of loans | loan | 1 |  |
Amount of consumer and indirect loans, outstanding | $ 2,000,000 |  |
Amount of consumer and indirect loans, specific reserves | $ 305,000 |  |
Number of borrowers | borrower | 1 |  |
Impaired loans with specific reserves: |  |  |
Recorded Investment | $ 2,000,000 |  |
Principal Balance | 2,000,000 |  |
Recorded Investment | 3,103,000 |  |
Impaired loans with no specific reserve: |  |  |
Recorded Investment | 1,238,000 |  | 1,194,000
Principal Balance | 1,548,000 |  | 1,194,000
Recorded Investment | $ 1,666,000 |  | $ 1,632,000

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