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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net income (loss) $ (45,174) $ 327,380 $ 323,770
Other comprehensive income (loss) before income taxes:      
Net change in unrealized gain/loss on available for sale securities and cash flow hedges 224,337 143,922 (52,757)
Reclassification of net gains (losses) realized and included in earnings (10,983) 13,429 34,966
Valuation adjustments for employee benefit plans (37,451) 2,398 (45,198)
Amortization of unrealized net loss on securities transferred to held to maturity (470) 3,153 3,296
Other comprehensive income (loss) before income taxes 175,433 162,902 (59,693)
Income tax expense (benefit) 40,640 36,917 (13,386)
Other comprehensive income (loss) net of income taxes 134,793 125,985 (46,307)
Comprehensive income $ 89,619 $ 453,365 $ 277,463