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Investment Securities - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 3,993,321 $ 2,434,627
Accrued Interest $ 15,997 $ 6,342
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Fair Value Fair Value
Gross Unrealized Gains $ 10,933 $ 15,528
Gross Unrealized Losses (26,941) (2,044)
Fair Value $ 3,993,310 $ 2,454,453
Percentage of high credit quality on amortized cost basis of investments 100.00% 99.00%
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 566,615 $ 74,540
Accrued Interest 7,579 1,115
Gross Unrealized Gains 558 166
Gross Unrealized Losses (5,196) (465)
Fair Value 569,556 75,356
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,409,844 2,335,501
Accrued Interest 8,328 5,095
Gross Unrealized Gains 10,375 15,362
Gross Unrealized Losses (21,484) (1,352)
Fair Value 3,407,063 2,354,606
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 93 184
Accrued Interest 1 3
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (2)
Fair Value 93 185
Asset-backed bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 12,421 19,626
Accrued Interest 54 83
Gross Unrealized Gains 0 0
Gross Unrealized Losses (34) (6)
Fair Value 12,441 19,703
Residual investments    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,394 3,825
Accrued Interest 27 38
Gross Unrealized Gains 0 0
Gross Unrealized Losses (87) (93)
Fair Value 3,334 3,770
Other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 954 951
Accrued Interest 8 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses (139) (126)
Fair Value $ 823 $ 833