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Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Tax expense |  | $ (8,248) | $ (6,760) | $ (15,637) | $ (13,656)
Available-for-sale securities: |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Total before tax |  | 0 | 240 | 0 | 472
Tax benefit |  | 0 | (96) | 0 | (189)
Net of tax |  | 0 | 144 | 0 | 283
Net retirement plan actuarial (gain) loss |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Total before tax | [1],[2] | (397) | (326) | (754) | (669)
Tax benefit |  | 159 | 131 | 302 | 268
Net of tax |  | (238) | (195) | (452) | (401)
Net retirement plan prior service cost |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Total before tax | [1],[2] | 15 | (8) | (8) | (38)
Tax benefit |  | (6) | 3 | 3 | 15
Net of tax |  | 9 | (5) | (5) | (23)
Employee Benefit Plans |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Total before tax | [1] | (382) | (334) | (762) | (707)
Tax benefit | [1] | 153 | 134 | 305 | 283
Net of tax | [1] | (229) | (200) | (457) | (424)
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 | [1] | 0 | 240 | 0 | 472
Tax expense | [1] | 0 | (96) | 0 | (189)
Net of tax | [1] | $ 0 | $ 144 | $ 0 | $ 283
[1] | Amounts in parentheses indicated debits in income statement.
[2] | The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - “Employee Benefit Plan”).

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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 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=65882285&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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