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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Assets
Loans held for sale at fair value	$ 1,773,052		$ 1,762,396
Loans held for investment at fair value	2,085,066		473,314
Securities available for sale:
Total securities available for sale	4,046,761		3,706,709
Servicing assets	72,974	$ 67,078	65,167	$ 57,909	$ 56,904	$ 60,697
Other assets	10,820		2,099
Total assets	7,988,673		6,009,685
Liabilities:
Other liabilities	1,845		5,783
Total liabilities	1,845		5,783
Senior asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	3,394,054		3,092,410
Other asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	257,820		219,370
U.S. agency residential mortgage-backed securities
Securities available for sale:
Total securities available for sale	243,375		236,061
U.S. agency securities
Securities available for sale:
Total securities available for sale	70,282		73,862
Mortgage-backed securities
Securities available for sale:
Total securities available for sale	53,806		55,597
Municipal securities
Securities available for sale:
Total securities available for sale	2,678		2,606
Other securities
Securities available for sale:
Total securities available for sale	24,746		26,803
Level 1
Assets
Loans held for sale at fair value	0		0
Loans held for investment at fair value	0		0
Securities available for sale:
Total securities available for sale	0		0
Servicing assets	0		0
Other assets	0		0
Total assets	0		0
Liabilities:
Other liabilities	0		0
Total liabilities	0		0
Level 1 | Senior asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	0		0
Level 1 | Other asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	0		0
Level 1 | U.S. agency residential mortgage-backed securities
Securities available for sale:
Total securities available for sale	0		0
Level 1 | U.S. agency securities
Securities available for sale:
Total securities available for sale	0		0
Level 1 | Mortgage-backed securities
Securities available for sale:
Total securities available for sale	0		0
Level 1 | Municipal securities
Securities available for sale:
Total securities available for sale	0		0
Level 1 | Other securities
Securities available for sale:
Total securities available for sale	0		0
Level 2
Assets
Loans held for sale at fair value	0		0
Loans held for investment at fair value	0		0
Securities available for sale:
Total securities available for sale	384,500		384,846
Servicing assets	0		0
Other assets	10,820		2,099
Total assets	395,320		386,945
Liabilities:
Other liabilities	1,845		3,918
Total liabilities	1,845		3,918
Level 2 | Senior asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	0		0
Level 2 | Other asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	0		0
Level 2 | U.S. agency residential mortgage-backed securities
Securities available for sale:
Total securities available for sale	243,375		236,061
Level 2 | U.S. agency securities
Securities available for sale:
Total securities available for sale	70,282		73,862
Level 2 | Mortgage-backed securities
Securities available for sale:
Total securities available for sale	53,806		55,597
Level 2 | Municipal securities
Securities available for sale:
Total securities available for sale	2,678		2,606
Level 2 | Other securities
Securities available for sale:
Total securities available for sale	14,359		16,720
Level 3
Assets
Loans held for sale at fair value	1,773,052		1,762,396
Loans held for investment at fair value	2,085,066		473,314
Securities available for sale:
Total securities available for sale	3,662,261		3,321,863
Servicing assets	72,974		65,167
Other assets	0		0
Total assets	7,593,353		5,622,740
Liabilities:
Other liabilities	0		1,865
Total liabilities	0		1,865
Level 3 | Senior asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	3,394,054		3,092,410
Level 3 | Other asset-backed securities related to Structured Program transactions
Securities available for sale:
Total securities available for sale	257,820		219,370
Level 3 | U.S. agency residential mortgage-backed securities
Securities available for sale:
Total securities available for sale	0		0
Level 3 | U.S. agency securities
Securities available for sale:
Total securities available for sale	0		0
Level 3 | Mortgage-backed securities
Securities available for sale:
Total securities available for sale	0		0
Level 3 | Municipal securities
Securities available for sale:
Total securities available for sale	0		0
Level 3 | Other securities
Securities available for sale:
Total securities available for sale	$ 10,387		$ 10,083

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