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Investment Securities - Schedule of Investments by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | $ 8 |
Due After One Year Through Five Years | 195,448 |
Due After Five Years Through Ten Years | 470,947 |
Due After Ten Years | 3,326,918 |
Total | $ 3,993,321 | $ 2,434,627
Weighted average yield for investments in AFS debt securities |  |
Due Within One Year | 0.95% |
Due After One Year Through Five Years | 4.03% |
Due After Five Years Through Ten Years | 4.21% |
Due After Ten Years | 4.62% |
Total | 4.55% |
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | $ 8 |
Due After One Year Through Five Years | 193,545 |
Due After Five Years Through Ten Years | 467,423 |
Due After Ten Years | 3,316,337 |
Total | 3,977,313 |
Accrued Interest | 15,997 | 6,342
U.S. Treasury securities |  |
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 148,886 |
Due After Five Years Through Ten Years | 417,729 |
Due After Ten Years | 0 |
Total | 566,615 | 74,540
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 147,111 |
Due After Five Years Through Ten Years | 414,866 |
Due After Ten Years | 0 |
Total | 561,977 |
Accrued Interest | 7,579 | 1,115
Agency mortgage-backed securities |  |
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | 8 |
Due After One Year Through Five Years | 46,469 |
Due After Five Years Through Ten Years | 36,449 |
Due After Ten Years | 3,326,918 |
Total | 3,409,844 | 2,335,501
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | 8 |
Due After One Year Through Five Years | 46,342 |
Due After Five Years Through Ten Years | 36,048 |
Due After Ten Years | 3,316,337 |
Total | 3,398,735 |
Accrued Interest | 8,328 | 5,095
Corporate bonds |  |
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 93 |
Due After Five Years Through Ten Years | 0 |
Due After Ten Years | 0 |
Total | 93 | 184
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 92 |
Due After Five Years Through Ten Years | 0 |
Due After Ten Years | 0 |
Total | 92 |
Accrued Interest | 1 | 3
Asset-backed bonds |  |
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 0 |
Due After Five Years Through Ten Years | 12,421 |
Due After Ten Years | 0 |
Total | 12,421 | 19,626
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 0 |
Due After Five Years Through Ten Years | 12,387 |
Due After Ten Years | 0 |
Total | 12,387 |
Accrued Interest | 54 | 83
Residual investments |  |
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 0 |
Due After Five Years Through Ten Years | 3,394 |
Due After Ten Years | 0 |
Total | 3,394 | 3,825
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 0 |
Due After Five Years Through Ten Years | 3,307 |
Due After Ten Years | 0 |
Total | 3,307 |
Accrued Interest | 27 | 38
Other |  |
Investments in AFS debt securities—Amortized cost: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 0 |
Due After Five Years Through Ten Years | 954 |
Due After Ten Years | 0 |
Total | 954 | 951
Investments in AFS debt securities—Fair value: |  |
Due Within One Year | 0 |
Due After One Year Through Five Years | 0 |
Due After Five Years Through Ten Years | 815 |
Due After Ten Years | 0 |
Total | 815 |
Accrued Interest | $ 8 | $ 8

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