Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loan Sales and Servicing Activities
Total loans serviced	$ 617,424,038	$ 607,216,769
California
Loan Sales and Servicing Activities
Total loans serviced	73,344,855	72,788,272
Florida
Loan Sales and Servicing Activities
Total loans serviced	59,174,541	57,824,310
Texas
Loan Sales and Servicing Activities
Total loans serviced	58,318,589	56,437,082
Virginia
Loan Sales and Servicing Activities
Total loans serviced	35,562,555	35,376,266
Maryland
Loan Sales and Servicing Activities
Total loans serviced	26,865,117	26,746,355
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 364,158,381	$ 358,044,484