Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Loan Sales and Servicing Activities
Total loans serviced	$ 576,459,295	$ 551,674,682
California
Loan Sales and Servicing Activities
Total loans serviced	69,242,770	68,542,279
Florida
Loan Sales and Servicing Activities
Total loans serviced	54,537,628	50,873,961
Texas
Loan Sales and Servicing Activities
Total loans serviced	52,283,855	47,911,696
Virginia
Loan Sales and Servicing Activities
Total loans serviced	34,432,055	33,478,151
Maryland
Loan Sales and Servicing Activities
Total loans serviced	25,999,115	25,473,417
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 339,963,872	$ 325,395,178