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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

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