Net Gains on Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Non-cash gain:
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	$ (1,735)	$ (4,054)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	1,445	3,169
Change in fair value of loans and derivatives held at period end:
Net gains on loans held for sale at fair value	104,385	298,459
PennyMac Mortgage Investment Trust
Change in fair value of loans and derivatives held at period end:
Net gains on loans held for sale at fair value	(485)	(9,652)
Non-affiliates
Cash (losses) gains:
Loans	(55,386)	(944,221)
Hedging activities	(216,138)	890,087
Cash gain (loss), net of effects of cash hedging, on sale of loans held for sale	(271,524)	(54,134)
Non-cash gain:
Mortgage servicing rights and mortgage servicing liabilities resulting from loan sales	286,533	616,302
Provision for losses relating to representations and warranties on loans sold pursuant to loan sales	(1,735)	(4,054)
Provision for losses relating to representations and warranties on loans sold reduction in liability due to change in estimate	1,445	3,169
Change in fair value of loans and derivatives held at period end:
Interest rate lock commitments	33,002	(284,294)
Loans	(64,191)	220,430
Hedging derivatives	121,340	(189,308)
Net gains on loans held for sale at fair value	$ 104,870	$ 308,111