Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loan Sales and Servicing Activities
Total loans serviced	$ 680,194,565	$ 665,763,827
California
Loan Sales and Servicing Activities
Total loans serviced	77,470,559	76,364,993
Texas
Loan Sales and Servicing Activities
Total loans serviced	67,407,963	65,317,775
Florida
Loan Sales and Servicing Activities
Total loans serviced	65,493,205	63,850,638
Virginia
Loan Sales and Servicing Activities
Total loans serviced	36,818,071	36,428,575
Georgia
Loan Sales and Servicing Activities
Total loans serviced	28,976,027	28,499,141
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 404,028,740	$ 395,302,705