Fair Value Measurement - Schedule of Rollforward of Level 3 Assets (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Loans (at fair value)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	$ 1,080,865	$ 982,229	$ 1,156,413	$ 1,010,421
Reclassification of loans	0		0
Purchases and originations of loans	569,371	490,151	1,194,609	657,967
Sale of loans	(672,325)	(550,860)	(1,235,663)	(618,392)
Purchase of loans for immediate resale	268,888	291,570	486,345	680,959
Immediate resale of loans	(268,888)	(291,570)	(486,345)	(680,959)
Repayments received	(107,835)	(69,885)	(200,256)	(152,258)
Charge-offs and changes in fair value recorded in earnings	(49,601)	(14,145)	(95,513)	(62,306)
Other changes	153	75	1,038	2,133
Fair value, ending balance	820,628	837,565	820,628	837,565
Loans Held-for- Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	763,314	839,482	830,574	882,810
Reclassification of loans	(3,189)		(3,189)
Purchases and originations of loans	504,582	448,773	1,083,668	569,388
Sale of loans	(672,325)	(550,860)	(1,235,663)	(618,392)
Purchase of loans for immediate resale	268,888	291,570	486,345	680,959
Immediate resale of loans	(268,888)	(291,570)	(486,345)	(680,959)
Repayments received	(64,665)	(47,302)	(119,973)	(108,803)
Charge-offs and changes in fair value recorded in earnings	(26,433)	866	(52,673)	(34,564)
Other changes	(3,362)	(1,108)	(4,822)	(588)
Fair value, ending balance	497,922	689,851	497,922	689,851
Loans Held-for-Investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	160,229	142,747	146,768	127,611
Reclassification of loans	3,189		3,189
Purchases and originations of loans	64,789	41,378	110,941	88,579
Sale of loans	0	0	0	0
Purchase of loans for immediate resale	0	0	0	0
Immediate resale of loans	0	0	0	0
Repayments received	(30,794)	(22,583)	(55,569)	(43,455)
Charge-offs and changes in fair value recorded in earnings	(13,342)	(15,011)	(23,603)	(27,742)
Other changes	3,515	1,183	5,860	2,721
Fair value, ending balance	187,586	147,714	187,586	147,714
Loans Held in Consolidated Securitization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	157,322	0	179,071	0
Reclassification of loans	0		0
Purchases and originations of loans	0	0	0	0
Sale of loans	0	0	0	0
Purchase of loans for immediate resale	0	0	0	0
Immediate resale of loans	0	0	0	0
Repayments received	(12,376)	0	(24,714)	0
Charge-offs and changes in fair value recorded in earnings	(9,826)	0	(19,237)	0
Other changes	0	0	0	0
Fair value, ending balance	$ 135,120	$ 0	$ 135,120	$ 0