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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Consolidated Statements of Comprehensive Income [Abstract] |  |  |  |  |
Net income |  | $ 58,902 | $ 46,719 | $ 160,183 | $ 97,465
Other comprehensive income: |  |  |  |  |
Net change in unrealized gain/loss on securities available for sale and hedges |  | 5,949 | (5,604) | 19,794 | 39,997
Reclassification of net losses realized and included in earnings |  | 1,374 | 1,158 | 4,479 | 2,960
Valuation adjustment for pension plan amendment | [1] |  |  | 17,315 |
Other valuation adjustments for employee benefit plans |  | 1,597 | (6,347) | (9,185) | (6,347)
Amortization of unrealized net loss on securities transferred to held to maturity |  | 977 | 1,108 | 2,726 | 2,736
Other comprehensive income/loss before income taxes |  | 9,897 | (9,685) | 35,129 | 39,346
Income tax expense (benefit) |  | 3,609 | (3,537) | 12,748 | 14,440
Other comprehensive income/loss net of income taxes |  | 6,288 | (6,148) | 22,381 | 24,906
Comprehensive income |  | $ 65,190 | $ 40,571 | $ 182,564 | $ 122,371
[1] | For further discussion of the pension plan amendment, see Note 11 - Retirement Plans.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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