Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred expense:
Mortgage servicing rights	$ 196,697	$ 128,471	$ 91,592
Reserves and losses	15,736	(33,477)	(2,945)
California franchise taxes	10,753	(15,200)
Additional tax basis in partnership from exchanges of partnership units into the Company's common stock	4,420	5,200	4,269
Compensation accruals	(11,456)	(647)	(12,286)
Net operating loss		581	23,445
Other	(1,717)	1,318	6,106
Tax credits	50		566
Total provision for deferred income taxes	214,483	86,246	$ 110,747
Components of income taxes payable:
Income taxes currently (receivable)	(126,542)
Income taxes currently payable		25,379
Deferred income tax liabilities, net	811,804	597,321
Income taxes payable	685,262	622,700
Deferred income tax assets:
Compensation accruals	53,141	41,685
Additional tax basis in partnership from exchanges of partnership units into the Company's common stock	30,277	34,697
Reserves and losses	47,275	63,011
California franchise tax	4,447	15,200
Net operating loss carryforward	1,077	1,077
Income tax credits carryforward		50
Gross deferred income tax assets	136,217	155,720
Deferred income tax liabilities:
Mortgage servicing rights	933,803	737,106
Other	14,218	15,935
Gross deferred income tax liabilities	948,021	753,041
Deferred income tax liabilities, net	811,804	597,321
Unrecognized tax benefits	0	0
Accrual of interest or penalties related to unrecognized tax benefits	$ 0	$ 0