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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 137,556 $ 87,412 $ 243,519 $ 180,055
Unrealized gains and losses on debt securities:        
Change in unrealized holding gains and losses, net (308,352) 76,335 (931,262) (122,703)
Less: Reclassification adjustment for gains included in net income   (1,300)   (4,020)
Amortization of net unrealized loss on securities transferred from available-for-sale to held-to-maturity 12,539   13,121  
Change in unrealized gains and losses on debt securities during the period (295,813) 75,035 (918,141) (126,723)
Unrealized gains and losses on derivative hedges:        
Change in unrealized gains and losses on derivative hedges 4,437 (3,422) 9,117 3,081
Less: Reclassification adjustment for gains included in net income (1,090) (877) (1,941) (1,719)
Change in unrealized gains and losses on derivative hedges 3,347 (4,299) 7,176 1,362
Other comprehensive (loss) income, before tax (292,466) 70,736 (910,965) (125,361)
Income tax benefit (expense) 70,791 (16,826) 219,848 30,128
Other comprehensive (loss) income (221,675) 53,910 (691,117) (95,233)
Comprehensive (loss) income $ (84,119) $ 141,322 $ (447,598) $ 84,822