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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | $ 25,715 | $ 26,361 | $ 76,549 | $ 80,432
Tax (expense) benefit | (5,478) | (5,427) | (15,816) | (16,939)
Other operating expense | (11,298) | (12,493) | (35,451) | (36,908)
Net of tax | 20,206 | 20,902 | 60,638 | 63,397
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | 133 | 30 | 404 | 324
Tax (expense) benefit | (32) | (7) | (99) | (79)
Net of tax | 101 | 23 | 305 | 245
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other operating expense | (411) | (430) | (1,232) | (1,289)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan prior service cost |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other operating expense | (4) | (4) | (11) | (12)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee benefit plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | (415) | (434) | (1,243) | (1,301)
Tax (expense) benefit | 102 | 106 | 305 | 319
Net of tax | $ (313) | $ (328) | $ (938) | $ (982)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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