Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for interest	$ 389,527	$ 272,970	$ 188,346
Cash paid for income taxes, net	293,131	475,594	32,457
Non-cash investing activity:
Mortgage servicing rights resulting from loan sales	1,861,949	1,138,045	884,876
Operating right-of-use assets recognized	28,401	14,128	83,248
Mortgage servicing liabilities resulting from loan sales	106,631	23,325	37,988
Non-cash financing activity:
Issuance of common stock in settlement of director fees	200	194	233
PennyMac Mortgage Investment Trust
Non-cash financing activity:
Issuance of Excess servicing spread payable to PennyMac Mortgage Investment Trust pursuant to a recapture agreement	$ 557	$ 2,093	$ 1,757