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Other Comprehensive (Loss) Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net gain on securities transactions |  |  |  |  |  |  |  |  | $ 57 | $ 64 | $ 654
Income tax expense (benefit) | $ (15,740) | $ (11,969) | $ (10,451) | $ (8,368) | $ (10,182) | $ (9,281) | $ (8,781) | $ (8,736) | (46,528) | (36,980) | (36,441)
Net of tax | $ 19,483 | $ 26,575 | $ 24,383 | $ 23,508 | $ 22,567 | $ 22,906 | $ 21,356 | $ 20,973 | 93,949 | 87,802 | 83,722
Total Reclassifications |  |  |  |  |  |  |  |  | 179 | 594 | 854
Total |  |  |  |  |  |  |  |  | (2,163) | (4,461) | (3,792)
Securities available for sale [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net gain on securities transactions |  |  |  |  |  |  |  |  | 0 | 50 | 654
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | (20) | (263)
Net of tax |  |  |  |  |  |  |  |  | 0 | 30 | 391
Post-retirement obligations - Amortization of actuarial losses [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  | 243 | 943 | 774
Income tax expense |  |  |  |  |  |  |  |  | (64) | (379) | (311)
Total Reclassifications |  |  |  |  |  |  |  |  | $ 179 | $ 564 | $ 463

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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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