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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Realized gains on securities available for sale | $ 0 | $ (75) | $ (12) | $ (983)
Tax effect | 1,710 | 1,209 | 4,250 | 3,130
Pension and other employee benefits | (992) | (1,573) | (3,417) | (4,894)
Net of tax | (3,654) | (2,745) | (9,589) | (7,073)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax | 21 | 186 | 54 | 86
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 | 0 | (75) | (12) | (983)
Tax effect | 0 | 28 | 4 | 371
Net of tax | 0 | (47) | (8) | (612)
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 | (12) | (141) | 37 | 423
Net of tax | 21 | 233 | 62 | 698
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) | (22) | (165) | (67)
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) | $ (264) | $ (1,188)

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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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