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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 94,467 $ 73,092 $ 274,522 $ 130,182
Unrealized gains and losses on debt securities:        
Change in unrealized holding gains and losses, net (75,717) 20,975 (198,420) 269,976
Less: Reclassification adjustment for gains included in net income (1,058) (311) (5,078) (5,544)
Change in unrealized gains and losses on debt securities during the period (76,775) 20,664 (203,498) 264,432
Unrealized gains and losses on derivative hedges:        
Change in unrealized gains and losses on derivative hedges 432 (122) 3,513 19,015
Less: Reclassification adjustment for gains included in net income (831) (1,123) (2,550) (869)
Change in unrealized gains and losses on derivative hedges (399) (1,245) 963 18,146
Other comprehensive (loss) income, before tax (77,174) 19,419 (202,535) 282,578
Income tax benefit (expense) 18,374 (4,578) 48,502 (66,655)
Other comprehensive (loss) income (58,800) 14,841 (154,033) 215,923
Comprehensive income $ 35,667 $ 87,933 $ 120,489 $ 346,105