v3.26.1
Investment Securities - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 3,043,774 $ 2,434,627
Accrued Interest $ 8,338 $ 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 $ 8,219 $ 15,528
Gross Unrealized Losses (11,971) (2,044)
Fair Value $ 3,048,360 $ 2,454,453
Percentage of high credit quality on amortized cost basis of investments 99.00% 99.00%
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 221,857 $ 74,540
Accrued Interest 1,026 1,115
Gross Unrealized Gains 205 166
Gross Unrealized Losses (1,500) (465)
Fair Value 221,588 75,356
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,801,325 2,335,501
Accrued Interest 7,205 5,095
Gross Unrealized Gains 8,014 15,362
Gross Unrealized Losses (10,132) (1,352)
Fair Value 2,806,412 2,354,606
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 184 184
Accrued Interest 3 3
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3) (2)
Fair Value 184 185
Asset-backed bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 15,919 19,626
Accrued Interest 68 83
Gross Unrealized Gains 0 0
Gross Unrealized Losses (62) (6)
Fair Value 15,925 19,703
Residual investments    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,537 3,825
Accrued Interest 32 38
Gross Unrealized Gains 0 0
Gross Unrealized Losses (143) (93)
Fair Value 3,426 3,770
Other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 952 951
Accrued Interest 4 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses (131) (126)
Fair Value $ 825 $ 833