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Investment Securities - Schedule of Investment Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | $ 2,356,813 | $ 276,280
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (25,888) | (1,061)
Investments in AFS debt securities, 12 months or longer, fair value | 15,158 | 20,680
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (1,053) | (983)
Investments in AFS debt securities, total, fair value | 2,371,971 | 296,960
Investments in AFS debt securities, total, gross unrealized losses | (26,941) | (2,044)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 519,542 | 49,962
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (5,196) | (465)
Investments in AFS debt securities, 12 months or longer, fair value | 0 | 0
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | 0 | 0
Investments in AFS debt securities, total, fair value | 519,542 | 49,962
Investments in AFS debt securities, total, gross unrealized losses | (5,196) | (465)
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 1,821,495 | 202,845
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (20,571) | (497)
Investments in AFS debt securities, 12 months or longer, fair value | 14,242 | 19,661
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (913) | (855)
Investments in AFS debt securities, total, fair value | 1,835,737 | 222,506
Investments in AFS debt securities, total, gross unrealized losses | (21,484) | (1,352)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | 0
Investments in AFS debt securities, 12 months or longer, fair value | 93 | 185
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (1) | (2)
Investments in AFS debt securities, total, fair value | 93 | 185
Investments in AFS debt securities, total, gross unrealized losses | (1) | (2)
Asset-backed bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 12,441 | 19,703
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (34) | (6)
Investments in AFS debt securities, 12 months or longer, fair value | 0 | 0
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | 0 | 0
Investments in AFS debt securities, total, fair value | 12,441 | 19,703
Investments in AFS debt securities, total, gross unrealized losses | (34) | (6)
Residual investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 3,335 | 3,770
Investments in AFS debt securities, less than 12 months, gross unrealized losses | (87) | (93)
Investments in AFS debt securities, 12 months or longer, fair value | 0 | 0
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | 0 | 0
Investments in AFS debt securities, total, fair value | 3,335 | 3,770
Investments in AFS debt securities, total, gross unrealized losses | (87) | (93)
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in AFS debt securities, less than 12 months, fair value | 0 | 0
Investments in AFS debt securities, less than 12 months, gross unrealized losses | 0 | 0
Investments in AFS debt securities, 12 months or longer, fair value | 823 | 834
Investments in AFS debt securities, 12 months or longer, gross unrealized losses | (139) | (126)
Investments in AFS debt securities, total, fair value | 823 | 834
Investments in AFS debt securities, total, gross unrealized losses | $ (139) | $ (126)

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