Principles of Consolidation - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) entity partnership	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership	2
VIE, ownership interest rate (as a percent)	80.00%
Servicing asset, fair value	$ 265,949	$ 310,953
Loans for sale at fair value that were acquired	$ 246,000
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership	2
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of securitization entities to which asset transferred (in entities) | entity	46
Number of entities called | entity	3
Unpaid principal balance of loans purchased	$ 102,000
Gain related to called security	$ 300
Servicing Investment | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, ownership interest rate (as a percent)	80.00%
Servicing asset, fair value	$ 99,000