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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income | $ 327,380 | $ 323,770 | $ 215,632
Other comprehensive income (loss) before income taxes: |  |  |
Net change in unrealized gain/loss on available for sale securities and cash flow hedges | 143,922 | (52,757) | (425)
Reclassification of net losses realized and included in earnings | 13,429 | 34,966 | 5,801
Valuation adjustment for pension plan amendment |  |  | 17,315
Other valuation adjustments of employee benefit plans | 2,398 | (45,198) | (10,929)
Amortization of unrealized net loss on securities transferred to held to maturity | 3,153 | 3,296 | 3,786
Other comprehensive income (loss) before income taxes | 162,902 | (59,693) | 15,548
Income tax expense (benefit) | 36,917 | (13,386) | 4,088
Other comprehensive income (loss) net of income taxes | 125,985 | (46,307) | 11,460
Comprehensive income | $ 453,365 | $ 277,463 | $ 227,092

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