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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
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)