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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance $ 2,307,041 $ 1,960,733 $ 1,515,854
Other comprehensive income (loss) before reclassifications (112,487) 103,714 52,346
Reclassification adjustments for gains included in net income (loss)   (850) (2,693)
Total other comprehensive (loss) income, net of tax (115,731) 102,864 49,653
Balance 3,177,622 2,307,041 1,960,733
Gains (Losses) on Available-For-Sale and Transferred Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance 143,443 40,226 (6,613)
Other comprehensive income (loss) before reclassifications (113,161) 104,067 57,607
Reclassification adjustments for gains included in net income (loss)   (850) (10,768)
Total other comprehensive (loss) income, net of tax (116,405) 103,217 46,839
Balance 27,038 143,443 40,226
(Losses) Gains on Derivatives Used for Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (353) 0 (2,814)
Other comprehensive income (loss) before reclassifications 674 (353) (5,261)
Reclassification adjustments for gains included in net income (loss) 0 0 8,075
Total other comprehensive (loss) income, net of tax 674 (353) 2,814
Balance 321 (353) 0
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance 143,090 40,226 (9,427)
Total other comprehensive (loss) income, net of tax (115,731) 102,864 49,653
Balance 27,359 $ 143,090 $ 40,226
Reclassification adjustments for gains and transfers included in net income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification adjustments for gains included in net income (loss) (590)    
Reclassifications adjustments for amortization included in net income for transferred securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification adjustments for gains included in net income (loss) $ (2,654)