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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net income | $ 364,149 | $ 304,261 | $ 279,328
Other comprehensive income (loss), before tax: |  |  |
Change in net unrealized gain/loss during the period | 157,016 | (175,061) | (12,450)
Change in net unrealized gain on securities transferred to held-to-maturity | (16,193) | (32,207) | (33,601)
Reclassification adjustment for net (gains) losses included in net income | 4,941 | (14,975) | (69)
Total securities available for sale and transferred securities | 145,764 | (222,243) | (46,120)
Defined-benefit post-retirement benefit plans: |  |  |
Change in the net actuarial gain/loss | (597) | 1,914 | (3,877)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 5,429 | 7,274 | 6,995
Total defined-benefit post-retirement benefit plans | 4,832 | 9,188 | 3,118
Reclassification adjustments for (gains) losses included in net income: |  |  |
Other comprehensive income (loss), before tax | 150,596 | (213,055) | (43,002)
Deferred tax expense (benefit) | 46,461 | (74,569) | (15,051)
Other comprehensive income (loss), net of tax | 104,135 | (138,486) | (27,951)
Comprehensive income | $ 468,284 | $ 165,775 | $ 251,377

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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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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