Significant Accounting Policies - (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies
Mortgage servicing rights, at fair value	$ 5,953,621	$ 3,878,078
Income taxes payable	1,002,744	685,262
Stockholders' equity	$ 3,471,049	$ 3,418,325	$ 3,389,388	$ 2,061,507