Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loan Sales and Servicing Activities
Total loans serviced	$ 527,275,458	$ 509,708,281
California
Loan Sales and Servicing Activities
Total loans serviced	67,505,093	67,317,935
Florida
Loan Sales and Servicing Activities
Total loans serviced	44,140,186	42,064,686
Texas
Loan Sales and Servicing Activities
Total loans serviced	47,896,679	45,222,233
Virginia
Loan Sales and Servicing Activities
Total loans serviced	32,497,446	31,442,370
Maryland
Loan Sales and Servicing Activities
Total loans serviced	24,673,589	23,922,075
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 310,562,465	$ 299,738,982