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Investment Securities - Schedule of Investment Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value $ 2,356,813 $ 276,280
Investments in AFS debt securities, less than 12 months, gross unrealized losses (25,888) (1,061)
Investments in AFS debt securities, 12 months or longer, fair value 15,158 20,680
Investments in AFS debt securities, 12 months or longer, gross unrealized losses (1,053) (983)
Investments in AFS debt securities, total, fair value 2,371,971 296,960
Investments in AFS debt securities, total, gross unrealized losses (26,941) (2,044)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value 519,542 49,962
Investments in AFS debt securities, less than 12 months, gross unrealized losses (5,196) (465)
Investments in AFS debt securities, 12 months or longer, fair value 0 0
Investments in AFS debt securities, 12 months or longer, gross unrealized losses 0 0
Investments in AFS debt securities, total, fair value 519,542 49,962
Investments in AFS debt securities, total, gross unrealized losses (5,196) (465)
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value 1,821,495 202,845
Investments in AFS debt securities, less than 12 months, gross unrealized losses (20,571) (497)
Investments in AFS debt securities, 12 months or longer, fair value 14,242 19,661
Investments in AFS debt securities, 12 months or longer, gross unrealized losses (913) (855)
Investments in AFS debt securities, total, fair value 1,835,737 222,506
Investments in AFS debt securities, total, gross unrealized losses (21,484) (1,352)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value 0 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses 0 0
Investments in AFS debt securities, 12 months or longer, fair value 93 185
Investments in AFS debt securities, 12 months or longer, gross unrealized losses (1) (2)
Investments in AFS debt securities, total, fair value 93 185
Investments in AFS debt securities, total, gross unrealized losses (1) (2)
Asset-backed bonds    
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value 12,441 19,703
Investments in AFS debt securities, less than 12 months, gross unrealized losses (34) (6)
Investments in AFS debt securities, 12 months or longer, fair value 0 0
Investments in AFS debt securities, 12 months or longer, gross unrealized losses 0 0
Investments in AFS debt securities, total, fair value 12,441 19,703
Investments in AFS debt securities, total, gross unrealized losses (34) (6)
Residual investments    
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value 3,335 3,770
Investments in AFS debt securities, less than 12 months, gross unrealized losses (87) (93)
Investments in AFS debt securities, 12 months or longer, fair value 0 0
Investments in AFS debt securities, 12 months or longer, gross unrealized losses 0 0
Investments in AFS debt securities, total, fair value 3,335 3,770
Investments in AFS debt securities, total, gross unrealized losses (87) (93)
Other    
Debt Securities, Available-for-sale [Line Items]    
Investments in AFS debt securities, less than 12 months, fair value 0 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses 0 0
Investments in AFS debt securities, 12 months or longer, fair value 823 834
Investments in AFS debt securities, 12 months or longer, gross unrealized losses (139) (126)
Investments in AFS debt securities, total, fair value 823 834
Investments in AFS debt securities, total, gross unrealized losses $ (139) $ (126)