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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | $ 27,003 | $ 24,167 | $ 36,898 | $ 50,834
Tax (expense) benefit | (5,540) | (4,743) | (7,449) | (10,338)
Other operating expense | (12,662) | (12,648) | (24,537) | (24,153)
Net of tax | 21,431 | 19,392 | 29,380 | 40,432
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 | 0 | 271 | 429 | 271
Tax (expense) benefit | 0 | (67) | (105) | (67)
Net of tax | 0 | 204 | 324 | 204
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 | (581) | (400) | (1,183) | (821)
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 | (54) | (3) | (107) | (7)
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 | (635) | (403) | (1,290) | (828)
Tax (expense) benefit | 155 | 99 | 316 | 203
Net of tax | $ (480) | $ (304) | $ (974) | $ (625)

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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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