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Securities Available for Sale - Schedule of Contractual Maturities of AFS Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Amortized Cost
Amortized Cost, Due within 1 year	$ 3,000
Amortized Cost, Due after 1 year through 5 years	3,672,108
Amortized Cost, Due after 5 years through 10 years	50,983
Amortized Cost, Due after 10 years	376,935
Amortized Cost	4,103,026	$ 3,733,780
Fair Value
Fair Value, Due within 1 year	2,978
Fair Value, Due after 1 year through 5 years	3,666,992
Fair Value, Due after 5 years through 10 years	46,071
Fair Value, Due after 10 years	330,720
Fair Value	$ 4,046,761	3,706,709
Weighted-average Yield, Due within 1 year	3.00%
Weighted-average Yield, Due after 1 year through 5 years	5.98%
Weighted-average Yield, Due after 5 years through 10 years	3.44%
Weighted-average Yield, Due after 10 years	3.15%
Weighted-average Yield	5.67%
U.S. agency securities
Amortized Cost
Amortized Cost, Due within 1 year	$ 3,000
Amortized Cost, Due after 1 year through 5 years	1,850
Amortized Cost, Due after 5 years through 10 years	39,464
Amortized Cost, Due after 10 years	37,153
Amortized Cost	81,467	84,464
Fair Value
Fair Value, Due within 1 year	2,978
Fair Value, Due after 1 year through 5 years	1,790
Fair Value, Due after 5 years through 10 years	34,844
Fair Value, Due after 10 years	30,670
Fair Value	70,282	73,862
Senior asset-backed securities related to Structured Program transactions
Amortized Cost
Amortized Cost, Due after 1 year through 5 years	3,390,657
Amortized Cost	3,390,657	3,065,885
Fair Value
Fair Value, Due after 1 year through 5 years	3,394,054
Fair Value	3,394,054	3,092,410
Other asset-backed securities related to Structured Program transactions
Amortized Cost
Amortized Cost, Due after 1 year through 5 years	266,096
Amortized Cost	266,096	224,802
Fair Value
Fair Value, Due after 1 year through 5 years	257,820
Fair Value	257,820	219,370
Mortgage-backed securities
Amortized Cost
Amortized Cost, Due after 1 year through 5 years	2,517
Amortized Cost, Due after 5 years through 10 years	863
Amortized Cost, Due after 10 years	55,808
Amortized Cost	59,188	60,423
Fair Value
Fair Value, Due after 1 year through 5 years	2,370
Fair Value, Due after 5 years through 10 years	760
Fair Value, Due after 10 years	50,676
Fair Value	53,806	55,597
Municipal securities
Amortized Cost
Amortized Cost, Due after 1 year through 5 years	457
Amortized Cost, Due after 5 years through 10 years	153
Amortized Cost, Due after 10 years	2,595
Amortized Cost	3,205	3,215
Fair Value
Fair Value, Due after 1 year through 5 years	431
Fair Value, Due after 5 years through 10 years	141
Fair Value, Due after 10 years	2,106
Fair Value	2,678	2,606
U.S. agency residential mortgage-backed securities
Amortized Cost
Amortized Cost, Due after 1 year through 5 years	101
Amortized Cost, Due after 5 years through 10 years	2,355
Amortized Cost, Due after 10 years	274,762
Fair Value
Fair Value, Due after 1 year through 5 years	97
Fair Value, Due after 5 years through 10 years	2,265
Fair Value, Due after 10 years	241,013
Fair Value	243,375	236,061
Other securities
Amortized Cost
Amortized Cost, Due after 1 year through 5 years	10,430
Amortized Cost, Due after 5 years through 10 years	8,148
Amortized Cost, Due after 10 years	6,617
Amortized Cost	25,195	27,138
Fair Value
Fair Value, Due after 1 year through 5 years	10,430
Fair Value, Due after 5 years through 10 years	8,061
Fair Value, Due after 10 years	6,255
Fair Value	$ 24,746	$ 26,803

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