Loan Sales and Servicing Activities - Summary of Cash Flows with Transferees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows:
Sales proceeds	$ 19,574,766	$ 41,739,700	$ 50,841,788	$ 79,007,900
Servicing fees received	228,834	$ 201,866	433,762	$ 397,648
Period end information:
Unpaid principal balance of loans outstanding	276,627,961		276,627,961		$ 254,524,015
30-89 days	8,229,868		8,229,868		6,129,597
90 days or more - Not in foreclosure	4,937,553		4,937,553		8,399,299
90 days or more - In foreclosure	761,684		761,684		715,016
90 days or more - Foreclosed	6,809		6,809		6,900
Bankruptcy	1,127,843		1,127,843		1,039,362
30-89 days delinquent under CARES Act	1,186,431		1,186,431		1,020,290
90 days or more delinquent not in foreclosure under CARES Act	2,346,059		2,346,059		2,550,703
Total delinquent loans in COVID-19 pandemic related forbearance	$ 3,532,490		$ 3,532,490		$ 3,570,993