Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loan Sales and Servicing Activities
Total loans serviced	$ 716,632,421	$ 665,763,827
California
Loan Sales and Servicing Activities
Total loans serviced	80,913,553	76,364,993
Texas
Loan Sales and Servicing Activities
Total loans serviced	71,811,884	65,317,775
Florida
Loan Sales and Servicing Activities
Total loans serviced	68,822,040	63,850,638
Virginia
Loan Sales and Servicing Activities
Total loans serviced	37,767,991	36,428,575
Georgia
Loan Sales and Servicing Activities
Total loans serviced	30,036,889	28,499,141
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 427,280,064	$ 395,302,705