Loan Sales and Servicing Activities - Summary of Cash Flows with Transferees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Cash flows:
Sales proceeds	$ 25,024,768	$ 19,574,766	$ 38,410,109	$ 50,841,788
Servicing fees received	282,315	$ 228,834	550,738	$ 433,762
Period end information:
Unpaid principal balance of loans outstanding	319,257,805		319,257,805		$ 295,032,674
30-89 days	11,388,376		11,388,376		11,019,194
90 days or more - Not in foreclosure	6,097,693		6,097,693		6,548,849
90 days or more - In foreclosure	708,722		708,722		834,155
90 days or more - Foreclosed	10,983		10,983		12,905
Bankruptcy	$ 1,256,468		$ 1,256,468		$ 1,143,484