Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Loan Sales and Servicing Activities
Total loans serviced	$ 648,054,285	$ 607,216,769
California
Loan Sales and Servicing Activities
Total loans serviced	74,743,579	72,788,272
Texas
Loan Sales and Servicing Activities
Total loans serviced	62,664,066	56,437,082
Florida
Loan Sales and Servicing Activities
Total loans serviced	62,385,137	57,824,310
Virginia
Loan Sales and Servicing Activities
Total loans serviced	36,081,471	35,376,266
Georgia
Loan Sales and Servicing Activities
Total loans serviced	27,991,453
Maryland
Loan Sales and Servicing Activities
Total loans serviced		26,746,355
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 384,188,579	$ 358,044,484