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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net gain on securities transactions | $ 26,229 | $ 23,137
Tax expense | (5,761) | (7,388)
Unrealized gains and losses on available-for-sale securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net of tax | 94 | 0
Net retirement plan actuarial (gain) loss |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | (417) | (357)
Net retirement plan prior service cost |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | (4) | (23)
Employee Benefit Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | (421) | (380)
Tax benefit | 103 | 152
Net of tax | (318) | (228)
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains and losses on available-for-sale securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net gain on securities transactions | 124 | 0
Tax expense | (30) | 0
Net of tax | $ 94 | $ 0

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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