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FAIR VALUE - Narrative (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Specific charges to value the real estate owned | $ 0 | $ 43,000 |
Change in fair value of foreclosed real estate | $ 0 | 43,000 | $ 32,000
Short-term borrowings maturity period | 90 days |  |
Impaired loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Changes in fair value of impaired loans and foreclosed real estate | $ 867,000 | 268,000 | $ 888,000
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value liabilities | 0 | 0 |
Allowance for loan losses or partial charge-offs | $ 2,266,000 | $ 1,967,000 |

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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