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v3.26.1

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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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