Net Gains on Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Non-cash gain:
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	$ (4,054)	$ (10,053)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	3,169	3,685
Change in fair value of loans and derivatives held at year end:
Net gains on loans held for sale at fair value	298,459	754,341
PennyMac Mortgage Investment Trust
Change in fair value of loans and derivatives held at year end:
Net gains on loans held for sale at fair value	(9,652)	(14,248)
Non-affiliates
Cash gains:
Loans	(944,221)	82,712
Hedging activities	890,087	736,225
Cash gain (loss), net of effects of cash hedging, on sale of loans held for sale	(54,134)	818,937
Non-cash gain:
Mortgage servicing rights and mortgage servicing liabilities resulting from loan sales	616,302	463,571
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(4,054)	(10,053)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	3,169	3,685
Change in fair value of loans and derivatives held at year end:
Interest rate lock commitments	(284,294)	(339,086)
Loans	220,430	105,222
Hedging derivatives	(189,308)	(273,687)
Net gains on loans held for sale at fair value	$ 308,111	$ 768,589