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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income (loss) | $ 79,356 | $ 67,807 | $ (148,749) | $ 235,248
Other comprehensive income (loss) before income taxes: |  |  |  |
Net change in unrealized gain or loss on securities available for sale and cash flow hedges | 425 | 34,159 | 217,254 | 160,627
Reclassification of net gain or loss realized and included in earnings | (4,076) | 3,280 | (6,593) | 11,483
Valuation adjustment to employee benefit plan |  | (7,015) | (10,251) | (7,015)
Amortization of unrealized net loss or gain on securities transferred to held to maturity | (89) | 954 | (378) | 2,435
Other comprehensive income (loss) before income taxes | (3,740) | 31,378 | 200,032 | 167,530
Income tax expense | 48 | 7,331 | 46,370 | 37,977
Other comprehensive income (loss) net of income taxes | (3,788) | 24,047 | 153,662 | 129,553
Comprehensive income | $ 75,568 | $ 91,854 | $ 4,913 | $ 364,801

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