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Securities Available for Sale - Schedule of AFS Securities with Unrealized Losses, Aggregated by Period of Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | $ 1,904,820 | $ 118,995
Unrealized Losses, Less than 12 months | (9,685) | (1,315)
Fair Value, 12 months or longer | 328,301 | 327,048
Unrealized Losses, 12 months or longer | (51,827) | (48,900)
Fair Value | 2,233,121 | 446,043
Unrealized Losses | (61,512) | (50,215)
Senior asset-backed securities related to Structured Program transactions |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 1,662,202 |
Unrealized Losses, Less than 12 months | (5,394) |
Fair Value, 12 months or longer | 0 |
Unrealized Losses, 12 months or longer | 0 |
Fair Value | 1,662,202 |
Unrealized Losses | (5,394) |
U.S. agency residential mortgage-backed securities |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 57,131 | 20,017
Unrealized Losses, Less than 12 months | (1,041) | (266)
Fair Value, 12 months or longer | 172,276 | 181,150
Unrealized Losses, 12 months or longer | (33,037) | (32,030)
Fair Value | 229,407 | 201,167
Unrealized Losses | (34,078) | (32,296)
Other asset-backed securities related to Structured Program transactions |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 158,040 | 95,494
Unrealized Losses, Less than 12 months | (2,926) | (1,034)
Fair Value, 12 months or longer | 44,543 | 23,719
Unrealized Losses, 12 months or longer | (1,555) | (333)
Fair Value | 202,583 | 119,213
Unrealized Losses | (4,481) | (1,367)
U.S. agency securities |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 0 | 0
Unrealized Losses, Less than 12 months | 0 | 0
Fair Value, 12 months or longer | 70,282 | 73,862
Unrealized Losses, 12 months or longer | (11,185) | (10,602)
Fair Value | 70,282 | 73,862
Unrealized Losses | (11,185) | (10,602)
Mortgage-backed securities |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 21,519 | 1,874
Unrealized Losses, Less than 12 months | (260) | (5)
Fair Value, 12 months or longer | 30,184 | 36,167
Unrealized Losses, 12 months or longer | (5,138) | (4,956)
Fair Value | 51,703 | 38,041
Unrealized Losses | (5,398) | (4,961)
Municipal securities |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 0 | 0
Unrealized Losses, Less than 12 months | 0 | 0
Fair Value, 12 months or longer | 2,678 | 2,606
Unrealized Losses, 12 months or longer | (527) | (609)
Fair Value | 2,678 | 2,606
Unrealized Losses | (527) | (609)
Other securities |  |
Schedule of Securities Available-for-sale [Line Items] |  |
Fair Value, Less than 12 months | 5,928 | 1,610
Unrealized Losses, Less than 12 months | (64) | (10)
Fair Value, 12 months or longer | 8,338 | 9,544
Unrealized Losses, 12 months or longer | (385) | (370)
Fair Value | 14,266 | 11,154
Unrealized Losses | $ (449) | $ (380)

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