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Investment Securities - Schedule of Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Fair value |  |
Less than 12 months | $ 1,177,187 | $ 826,487
12 months or more | 1,219,426 | 1,228,953
Total fair value | 2,396,613 | 2,055,440
Unrealized loss |  |
Less than 12 months | (4,156) | (2,966)
12 months or more | (243,503) | (238,468)
Total unrealized loss | (247,659) | (241,434)
Agency bond securities |  |
Fair value |  |
Less than 12 months | 0 | 0
12 months or more | 156,408 | 156,975
Total fair value | 156,408 | 156,975
Unrealized loss |  |
Less than 12 months | 0 | 0
12 months or more | (22,819) | (22,252)
Total unrealized loss | (22,819) | (22,252)
Agency mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 871,309 | 504,676
12 months or more | 1,040,496 | 1,049,422
Total fair value | 1,911,805 | 1,554,098
Unrealized loss |  |
Less than 12 months | (2,839) | (1,764)
12 months or more | (215,075) | (210,635)
Total unrealized loss | (217,914) | (212,399)
Municipal bonds |  |
Fair value |  |
Less than 12 months | 0 | 0
12 months or more | 22,522 | 22,556
Total fair value | 22,522 | 22,556
Unrealized loss |  |
Less than 12 months | 0 | 0
12 months or more | (5,609) | (5,581)
Total unrealized loss | (5,609) | (5,581)
Asset-backed securities |  |
Fair value |  |
Less than 12 months | 305,878 | 321,811
12 months or more | 0 | 0
Total fair value | 305,878 | 321,811
Unrealized loss |  |
Less than 12 months | (1,317) | (1,202)
12 months or more | 0 | 0
Total unrealized loss | $ (1,317) | $ (1,202)

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