v3.26.3
Net Gains on Loans Held for Sale - Summary of Net Gains on Mortgage Loans Held for Sale (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Non-cash (losses) gains:        
Receipt of MSRs in mortgage loan sale transactions     $ (88,188) $ (136,783)
Provision for losses relating to representations and warranties provided in loan sales:        
Pursuant to loan sales $ (302) $ (222) (960) (753)
Changes in fair value of loans and derivatives        
Total non-cash (losses) gains (531,924) 48,480 (626,215) 90,820
Net gains on loans held for sale 5,196 14,857 43,398 45,007
PennyMac Financial Services, Inc. [Member]        
Changes in fair value of loans and derivatives        
Net gains on loans held for sale 0 531 0 5,204
Nonaffiliates [Member]        
Cash gains (losses):        
Sales of loans (25,916) 5,289 (66,502) (8,244)
Hedging activities 36,771 (18,535) 49,673 (97,652)
Cash gain, net of effects of cash hedging, on sale of mortgage loans held for sale 10,855 (13,246) (16,829) (105,896)
Non-cash (losses) gains:        
Receipt of MSRs in mortgage loan sale transactions 16,926 45,744 88,188 136,783
Provision for losses relating to representations and warranties provided in loan sales:        
Pursuant to loan sales (302) (222) (960) (753)
Reduction of liability due to change in estimate 323 39 1,010 2,119
Provision for losses relating to representations and warranties 21 (183) 50 1,366
Changes in fair value of loans and derivatives        
Interest rate lock commitments (19,031) (2,033) (18,434) 5,045
Loans (86,739) (4,058) (86,203) (26,017)
Hedging derivatives 83,164 (11,898) 76,626 28,522
Total changes in fair value of loans and derivatives (22,606) (17,989) (28,011) 7,550
Total non-cash (losses) gains (5,659) 27,572 60,227 145,699
Net gains on loans held for sale $ 5,196 $ 14,326 $ 43,398 $ 39,803