v3.26.1
Segments - Financial Highlights by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Net investment income:      
Net loan servicing fees $ 83,586 $ (27,210)  
Net gains on loans held for sale 22,910 12,344  
Net (losses) gains on investments and financings      
Mortgage-backed securities (33,407) 64,855  
Loans held for investment (3,567) (742)  
Credit risk transfer arrangements 13,911 (1,800)  
Net (losses) gains on investments and financings (23,063) 62,313  
Net interest expense:      
Interest income 276,091 176,091  
Interest expense 279,750 182,137  
Net interest expense (3,659) (6,046)  
Other 2,360 3,064  
Net investment income 82,134 44,465  
Expenses:      
Professional services 13,501 6,982  
Compensation 2,976 2,970  
Loan collection and liquidation 2,124 1,969  
Safekeeping 855 1,110  
Loan origination 213 686  
Other 3,348 3,016  
Total expenses 55,239 50,764  
Income (loss) before provision for (benefit from) income taxes 26,895 (6,299)  
Total assets at end of quarter 22,502,692 14,876,226 $ 21,346,882
PennyMac Financial Services, Inc. [Member]      
Net investment income:      
Net gains on loans held for sale 0 2,015  
Expenses:      
Loan servicing fees 19,723 21,729  
Management fees 6,762 7,012  
Loan fulfillment fees 5,737 5,290  
Reportable Segment [Member]      
Net investment income:      
Net loan servicing fees 83,586 (27,210)  
Net gains on loans held for sale 22,910 12,344  
Net (losses) gains on investments and financings      
Mortgage-backed securities (33,407) 64,855  
Loans held for investment (3,567) (742)  
Credit risk transfer arrangements 13,911 (1,800)  
Net (losses) gains on investments and financings (23,063) 62,313  
Net interest expense:      
Interest income 273,390 172,643  
Interest expense 277,838 180,971  
Net interest expense (4,448) (8,328)  
Other 2,360 3,064  
Net investment income 81,345 42,183  
Expenses:      
Professional services 10,844 4,880  
Compensation 0 0  
Loan collection and liquidation 2,124 1,969  
Safekeeping 855 1,110  
Loan origination 213 686  
Other 981 756  
Total expenses 40,477 36,420  
Income (loss) before provision for (benefit from) income taxes 40,868 5,763  
Total assets at end of quarter 22,099,750 14,423,545  
Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]      
Expenses:      
Loan servicing fees 19,723 21,729  
Management fees 0 0  
Loan fulfillment fees 5,737 5,290  
Corporate [Member]      
Net investment income:      
Net loan servicing fees 0 0  
Net gains on loans held for sale 0 0  
Net (losses) gains on investments and financings      
Mortgage-backed securities 0 0  
Loans held for investment 0 0  
Credit risk transfer arrangements 0 0  
Net (losses) gains on investments and financings 0 0  
Net interest expense:      
Interest income 2,701 3,448  
Interest expense 1,912 1,166  
Net interest expense 789 2,282  
Other 0 0  
Net investment income 789 2,282  
Expenses:      
Professional services 2,657 2,102  
Compensation 2,976 2,970  
Loan collection and liquidation 0 0  
Safekeeping 0 0  
Loan origination 0 0  
Other 2,367 2,260  
Total expenses 14,762 14,344  
Income (loss) before provision for (benefit from) income taxes (13,973) (12,062)  
Total assets at end of quarter 402,942 452,681  
Corporate [Member] | PennyMac Financial Services, Inc. [Member]      
Expenses:      
Loan servicing fees 0 0  
Management fees 6,762 7,012  
Loan fulfillment fees 0 0  
Credit Sensitive Strategies [Member] | Reportable Segment [Member]      
Net investment income:      
Net loan servicing fees 0 0  
Net gains on loans held for sale 0 0  
Net (losses) gains on investments and financings      
Mortgage-backed securities 0 (1,010)  
Loans held for investment 2,191 2,767  
Credit risk transfer arrangements 13,911 (1,800)  
Net (losses) gains on investments and financings 16,102 (43)  
Net interest expense:      
Interest income 19,229 19,549  
Interest expense 18,727 18,117  
Net interest expense 502 1,432  
Other (48) (141)  
Net investment income 16,556 1,248  
Expenses:      
Professional services 0 0  
Compensation 0 0  
Loan collection and liquidation 17 42  
Safekeeping 0 0  
Loan origination 0 0  
Other 77 94  
Total expenses 96 138  
Income (loss) before provision for (benefit from) income taxes 16,460 1,110  
Total assets at end of quarter 1,756,200 1,517,529  
Credit Sensitive Strategies [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]      
Expenses:      
Loan servicing fees 2 2  
Management fees 0 0  
Loan fulfillment fees 0 0  
Interest Rate Sensitive Strategies [Member] | Reportable Segment [Member]      
Net investment income:      
Net loan servicing fees 83,586 (27,210)  
Net gains on loans held for sale 0 0  
Net (losses) gains on investments and financings      
Mortgage-backed securities (33,407) 65,865  
Loans held for investment (5,758) (3,509)  
Credit risk transfer arrangements 0 0  
Net (losses) gains on investments and financings (39,165) 62,356  
Net interest expense:      
Interest income 214,630 119,896  
Interest expense 227,557 135,332  
Net interest expense (12,927) (15,436)  
Other 0 0  
Net investment income 31,494 19,710  
Expenses:      
Professional services 0 0  
Compensation 0 0  
Loan collection and liquidation 2,107 1,927  
Safekeeping 802 1,034  
Loan origination 0 0  
Other 873 496  
Total expenses 23,503 25,184  
Income (loss) before provision for (benefit from) income taxes 7,991 (5,474)  
Total assets at end of quarter 17,934,880 10,860,903  
Interest Rate Sensitive Strategies [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]      
Expenses:      
Loan servicing fees 19,721 21,727  
Management fees 0 0  
Loan fulfillment fees 0 0  
Aggregation and Securitization [Member] | Reportable Segment [Member]      
Net investment income:      
Net loan servicing fees 0 0  
Net gains on loans held for sale 22,910 12,344  
Net (losses) gains on investments and financings      
Mortgage-backed securities 0 0  
Loans held for investment 0 0  
Credit risk transfer arrangements 0 0  
Net (losses) gains on investments and financings 0 0  
Net interest expense:      
Interest income 39,531 33,198  
Interest expense 31,554 27,522  
Net interest expense 7,977 5,676  
Other 2,408 3,205  
Net investment income 33,295 21,225  
Expenses:      
Professional services 10,844 4,880  
Compensation 0 0  
Loan collection and liquidation 0 0  
Safekeeping 53 76  
Loan origination 213 686  
Other 31 166  
Total expenses 16,878 11,098  
Income (loss) before provision for (benefit from) income taxes 16,417 10,127  
Total assets at end of quarter 2,408,670 2,045,113  
Aggregation and Securitization [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]      
Expenses:      
Loan servicing fees 0 0  
Management fees 0 0  
Loan fulfillment fees $ 5,737 $ 5,290