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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Realized gains on securities available for sale | $ 12 | $ 0 | $ 12 | $ 908
Tax effect | 1,263 | 605 | 2,540 | 1,921
Pension and other employee benefits | 1,207 | 1,646 | 2,425 | 3,321
Net of tax | 2,956 | 1,621 | 5,935 | 4,328
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax | 12 | 232 | 33 | (100)
Unrealized Gains and Losses on Securities Available for Sale | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Realized gains on securities available for sale | (12) | 0 | (12) | (908)
Tax effect | 4 | 0 | 4 | 343
Net of tax | (8) | 0 | (8) | (565)
Defined Benefit and Other Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax effect | (13) | (141) | (25) | (282)
Net of tax | 20 | 232 | 41 | 465
Prior Service Costs | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension and other employee benefits | (55) | (23) | (110) | (45)
Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension and other employee benefits | $ 88 | $ 396 | $ 176 | $ 792

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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