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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net income | $ 304,261 | $ 279,328 | $ 277,977
Other comprehensive income (loss), before tax: |  |  |
Change in net unrealized gain/loss during the period | (175,061) | (12,450) | 103,044
Change in net unrealized gain on securities transferred to held-to-maturity | (32,207) | (33,601) | (35,441)
Reclassification adjustment for net (gains) losses included in net income | (14,975) | (69) | (38)
Total securities available for sale and transferred securities | (222,243) | (46,120) | 67,565
Defined-benefit post-retirement benefit plans: |  |  |
Change in the net actuarial gain/loss | 1,914 | (3,877) | (37,524)
Reclassification adjustment for net amortization of actuarial gain(loss) and for SERP settlement costs included in net income, before tax amount | 7,274 |  |
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) |  | 6,995 | 2,687
Total defined-benefit post-retirement benefit plans | 9,188 | 3,118 | (34,837)
Reclassification adjustments for (gains) losses included in net income: |  |  |
Reclassification adjustment for gains on interest rate swaps on variable-rate loans included in net income | 0 | 0 | (30,604)
Total derivatives | 0 | 0 | (30,604)
Other comprehensive income (loss), before tax | (213,055) | (43,002) | 2,124
Deferred tax expense (benefit) | (74,569) | (15,051) | 744
Other comprehensive income (loss), net of tax | (138,486) | (27,951) | 1,380
Comprehensive income | $ 165,775 | $ 251,377 | $ 279,357

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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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