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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Roll Forward] |  |
Balance | $ (2,182) | $ (1,901)
Change during period: |  |
Before-tax amount | 250 | (557)
Tax benefit (expense) | (88) | 197
Reclassification adjustment, net of taxes |  |
Amortization of net loss | 59 | 54
Net realized gain (loss) | (19) | 25
Total activity in period | 202 | (281)
Balance | (1,980) | (2,182)
Pension Adjustment |  |
Accumulated Other Comprehensive Income Loss [Roll Forward] |  |
Balance | (2,151) | (1,899)
Change during period: |  |
Before-tax amount | 241 | (474)
Tax benefit (expense) | (85) | 168
Reclassification adjustment, net of taxes |  |
Amortization of net loss | 59 | 54
Net realized gain (loss) | 0 | 0
Total activity in period | 215 | (252)
Balance | (1,936) | (2,151)
Unrealized Loss on Securities |  |
Accumulated Other Comprehensive Income Loss [Roll Forward] |  |
Balance | (31) | (2)
Change during period: |  |
Before-tax amount | 9 | (83)
Tax benefit (expense) | (3) | 29
Reclassification adjustment, net of taxes |  |
Amortization of net loss | 0 | 0
Net realized gain (loss) | (19) | 25
Total activity in period | (13) | (29)
Balance | $ (44) | $ (31)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 + Details
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