Fair Value Measurement - Loans Rollforward (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans (at fair value)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	$ 252,477	$ 78,460
Reclassification of loans	0
Purchases of loans	1,957,131	378,526
Sale of loans	(914,369)	(163,972)
Purchase of loans for immediate resale	5,992,148	8,713,476
Immediate resale of loans	(5,992,148)	(8,713,476)
Repayments received	(195,329)	(33,190)
Changes in fair value recorded in earnings	(99,782)	(9,054)
Changes in accrued interest and other charges	10,293	1,707
Fair value, ending balance	1,010,421	252,477
Loan Held For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	142,685	60,232
Reclassification of loans	103,677
Purchases of loans	1,807,787	219,128
Sale of loans	(914,369)	(123,370)
Purchase of loans for immediate resale	5,992,148	8,713,476
Immediate resale of loans	(5,992,148)	(8,713,476)
Repayments received	(180,135)	(10,578)
Changes in fair value recorded in earnings	(85,567)	(3,284)
Changes in accrued interest and other charges	8,732	557
Fair value, ending balance	882,810	142,685
Loans Held For Investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning balance	109,792	18,228
Reclassification of loans	(103,677)
Purchases of loans	149,344	159,398
Sale of loans	0	(40,602)
Purchase of loans for immediate resale	0	0
Immediate resale of loans	0	0
Repayments received	(15,194)	(22,612)
Changes in fair value recorded in earnings	(14,215)	(5,770)
Changes in accrued interest and other charges	1,561	1,150
Fair value, ending balance	$ 127,611	$ 109,792