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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax    
Balance, beginning $ 3,177,622 $ 2,307,041
Other comprehensive (loss) income before reclassifications (274,077) (62,927)
Reclassification adjustments for gains included in net loss   (243)
Total other comprehensive loss, net of tax (275,168) (63,170)
Balance, ending 2,934,193 2,295,385
Gains (Losses) on Available-For-Sale and Transferred Debt Securities    
AOCI Attributable to Parent, Net of Tax    
Balance, beginning 27,038 143,443
Other comprehensive (loss) income before reclassifications (276,295) (63,370)
Reclassification adjustments for gains included in net loss   (243)
Total other comprehensive loss, net of tax (277,386) (63,613)
Balance, ending (250,348) 79,830
(Losses) Gains on Derivatives Used for Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax    
Balance, beginning 321 (353)
Other comprehensive (loss) income before reclassifications 2,218 443
Reclassification adjustments for gains included in net loss   0
Total other comprehensive loss, net of tax 2,218 443
Balance, ending 2,539 90
Reclassification adjustments for gains and transfers included in net income    
AOCI Attributable to Parent, Net of Tax    
Reclassification adjustments for gains included in net loss (507)  
Reclassification adjustments for amortization included in net income for transferred securities    
AOCI Attributable to Parent, Net of Tax    
Reclassification adjustments for gains included in net loss (584)  
Accumulated Other Compre- hensive Income (loss)    
AOCI Attributable to Parent, Net of Tax    
Balance, beginning 27,359 143,090
Total other comprehensive loss, net of tax (275,168) (63,170)
Balance, ending $ (247,809) $ 79,920