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TAX EFFECT ALLOCATED TO EACH COMPONENT OF OTHER COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Income and Comprehensive Income |  |  |  |
Amortization of net losses of pension and postretirement benefit plans | $ (2,101) | $ (2,185) | $ (6,301) | $ (6,556)
Amortization of prior service credit of pension and postretirement benefit plans | 339 | 370 | 1,016 | 1,110
Unrealized holding (losses) gains on debt securities arising during the period | 3,936 | 122 | 13,701 | 239
Other-than-temporary impairment included in net income | 0 | 0 | 0 | (1,559)
Reclassification adjustment for gains included in net income | 0 | 17 | 0 | 17
Unrealized holding gains on equity securities arising during the period | 0 | (12) | 0 | (45)
Reclassification adjustment for gains included in net income | 0 | 4 | 0 | 40
Unrealized net gains (losses) on cash flow hedges | (133) | 160 | (506) | 555
Reclassification adjustment for net losses (gains) included in net income | (58) | (90) | 339 | (827)
Income tax benefit (expense) | $ 1,983 | $ (1,614) | $ 8,249 | $ (7,026)

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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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