Loan Sales and Servicing Activities - Geographical Distribution of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loan Sales and Servicing Activities
Total loans serviced	$ 551,674,682	$ 509,708,281
California
Loan Sales and Servicing Activities
Total loans serviced	68,542,279	67,317,935
Florida
Loan Sales and Servicing Activities
Total loans serviced	50,873,961	45,222,233
Texas
Loan Sales and Servicing Activities
Total loans serviced	47,911,696	42,064,686
Virginia
Loan Sales and Servicing Activities
Total loans serviced	33,478,151	31,442,370
Maryland
Loan Sales and Servicing Activities
Total loans serviced	25,473,417	23,922,075
All other states
Loan Sales and Servicing Activities
Total loans serviced	$ 325,395,178	$ 299,738,982