v3.25.2
Segments - Financial Highlights by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Net gains (losses) on investments and financings          
Mortgage-backed securities $ 14,564 $ (34,925) $ 79,419 $ (53,025)  
Loans held for investment (1,134) (1,447) (1,876) 4,751  
Credit risk transfer arrangements 20,250 16,629 18,450 68,284  
Net gains (losses) on investments and financings 33,680 (19,743) 95,993 20,010  
Net gains on loans acquired for sale 17,806 12,160 30,150 26,678  
Net loan servicing fees 23,947 96,494 (3,263) 142,199  
Net interest expense:          
Interest income 196,481 151,835 372,572 295,394  
Interest expense 205,149 171,841 387,286 343,368  
Net interest income (expense) (8,668) (20,006) (14,714) (47,974)  
Other 3,436 2,293 6,500 4,490  
Net investment income 70,201 71,198 114,666 145,403  
Expenses:          
Professional services 8,362 2,366 15,344 4,124  
Compensation 2,836 1,369 5,806 3,285  
Loan collection and liquidation 2,385 671 4,354 2,040  
Safekeeping 1,228 961 2,338 1,893  
Loan origination 666 533 1,352 1,006  
Other 3,390 4,865 6,406 8,775  
Total expenses 53,195 42,589 103,959 84,413  
Income before provision for (benefit from) income taxes 17,006 28,609 10,707 60,990  
Total assets at end of quarter 16,801,119 12,080,950 16,801,119 12,080,950 $ 14,408,706
PennyMac Financial Services, Inc. [Member]          
Net gains (losses) on investments and financings          
Net gains on loans acquired for sale 2,658 2,050 4,673 3,655  
Expenses:          
Loan servicing fees 21,645 20,264 43,374 40,526  
Management fees 6,869 7,133 13,881 14,321  
Loan fulfillment fees 5,814 4,427 11,104 8,443  
Reportable Segment [Member]          
Net gains (losses) on investments and financings          
Mortgage-backed securities 14,564 (34,925) 79,419 (53,025)  
Loans held for investment (1,134) (1,447) (1,876) 4,751  
Credit risk transfer arrangements 20,250 16,629 18,450 68,284  
Net gains (losses) on investments and financings 33,680 (19,743) 95,993 20,010  
Net gains on loans acquired for sale 17,806 12,160 30,150 26,678  
Net loan servicing fees 23,947 96,494 (3,263) 142,199  
Net interest expense:          
Interest income 194,350 149,146 366,993 289,425  
Interest expense 203,711 170,844 384,682 340,940  
Net interest income (expense) (9,361) (21,698) (17,689) (51,515)  
Other 3,436 2,293 6,500 4,490  
Net investment income 69,508 69,506 111,691 141,862  
Expenses:          
Professional services 6,381 0 11,261 0  
Compensation 0 0 0 0  
Loan collection and liquidation 2,385 671 4,354 2,040  
Safekeeping 1,228 961 2,338 1,893  
Loan origination 666 533 1,352 1,006  
Other 722 486 1,479 541  
Total expenses 38,841 27,342 75,262 54,449  
Income before provision for (benefit from) income taxes 30,667 42,164 36,429 87,413  
Total assets at end of quarter 16,329,474 11,613,016 16,329,474 11,613,016  
Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 21,645 20,264 43,374 40,526  
Management fees 0 0 0 0  
Loan fulfillment fees 5,814 4,427 11,104 8,443  
Corporate [Member]          
Net gains (losses) on investments and financings          
Mortgage-backed securities 0 0 0 0  
Loans held for investment 0 0 0 0  
Credit risk transfer arrangements 0 0 0 0  
Net gains (losses) on investments and financings 0 0 0 0  
Net gains on loans acquired for sale 0 0 0 0  
Net loan servicing fees 0 0 0 0  
Net interest expense:          
Interest income 2,131 2,689 5,579 5,969  
Interest expense 1,438 997 2,604 2,428  
Net interest income (expense) 693 1,692 2,975 3,541  
Other 0 0 0 0  
Net investment income 693 1,692 2,975 3,541  
Expenses:          
Professional services 1,981 2,366 4,083 4,124  
Compensation 2,836 1,369 5,806 3,285  
Loan collection and liquidation 0 0 0 0  
Safekeeping 0 0 0 0  
Loan origination 0 0 0 0  
Other 2,668 4,379 4,927 8,234  
Total expenses 14,354 15,247 28,697 29,964  
Income before provision for (benefit from) income taxes (13,661) (13,555) (25,722) (26,423)  
Total assets at end of quarter 471,645 467,934 471,645 467,934  
Corporate [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 0 0 0 0  
Management fees 6,869 7,133 13,881 14,321  
Loan fulfillment fees 0 0 0 0  
Credit Sensitive Strategies [Member] | Reportable Segment [Member]          
Net gains (losses) on investments and financings          
Mortgage-backed securities 506 2,252 (504) 6,697  
Loans held for investment (958) (1,471) 1,809 2,020  
Credit risk transfer arrangements 20,250 16,629 18,450 68,284  
Net gains (losses) on investments and financings 19,798 17,410 19,755 77,001  
Net gains on loans acquired for sale 0 0 0 0  
Net loan servicing fees 0 0 0 0  
Net interest expense:          
Interest income 20,971 22,923 40,520 47,132  
Interest expense 18,824 24,272 36,942 47,282  
Net interest income (expense) 2,147 (1,349) 3,578 (150)  
Other 0 (224) (142) (90)  
Net investment income 21,945 15,837 23,191 76,761  
Expenses:          
Professional services 0 0 0 0  
Compensation 0 0 0 0  
Loan collection and liquidation 20 (1) 63 54  
Safekeeping 0 0 0 0  
Loan origination 0 0 0 0  
Other 89 79 182 102  
Total expenses 111 99 249 197  
Income before provision for (benefit from) income taxes 21,834 15,738 22,942 76,564  
Total assets at end of quarter 1,581,220 1,471,470 1,581,220 1,471,470  
Credit Sensitive Strategies [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 2 21 4 41  
Management fees 0 0 0 0  
Loan fulfillment fees 0 0 0 0  
Interest Rate Sensitive Strategies [Member] | Reportable Segment [Member]          
Net gains (losses) on investments and financings          
Mortgage-backed securities 14,058 (37,177) 79,923 (59,722)  
Loans held for investment (176) 24 (3,685) 2,731  
Credit risk transfer arrangements 0 0 0 0  
Net gains (losses) on investments and financings 13,882 (37,153) 76,238 (56,991)  
Net gains on loans acquired for sale 0 0 0 0  
Net loan servicing fees 23,947 96,494 (3,263) 142,199  
Net interest expense:          
Interest income 137,493 111,316 257,389 215,495  
Interest expense 154,614 131,566 289,945 266,391  
Net interest income (expense) (17,121) (20,250) (32,556) (50,896)  
Other 0 0 0 0  
Net investment income 20,708 39,091 40,419 34,312  
Expenses:          
Professional services 0 0 0 0  
Compensation 0 0 0 0  
Loan collection and liquidation 2,365 672 4,291 1,986  
Safekeeping 1,144 894 2,178 1,771  
Loan origination 0 0 0 0  
Other 444 407 943 439  
Total expenses 25,596 22,216 50,782 44,681  
Income before provision for (benefit from) income taxes (4,888) 16,875 (10,363) (10,369)  
Total assets at end of quarter 12,082,858 9,421,790 12,082,858 9,421,790  
Interest Rate Sensitive Strategies [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 21,643 20,243 43,370 40,485  
Management fees 0 0 0 0  
Loan fulfillment fees 0 0 0 0  
Correspondent Production [Member] | Reportable Segment [Member]          
Net gains (losses) on investments and financings          
Mortgage-backed securities 0 0 0 0  
Loans held for investment 0 0 0 0  
Credit risk transfer arrangements 0 0 0 0  
Net gains (losses) on investments and financings 0 0 0 0  
Net gains on loans acquired for sale 17,806 12,160 30,150 26,678  
Net loan servicing fees 0 0 0 0  
Net interest expense:          
Interest income 35,886 14,907 69,084 26,798  
Interest expense 30,273 15,006 57,795 27,267  
Net interest income (expense) 5,613 (99) 11,289 (469)  
Other 3,436 2,517 6,642 4,580  
Net investment income 26,855 14,578 48,081 30,789  
Expenses:          
Professional services 6,381 0 11,261 0  
Compensation 0 0 0 0  
Loan collection and liquidation 0 0 0 0  
Safekeeping 84 67 160 122  
Loan origination 666 533 1,352 1,006  
Other 189 0 354 0  
Total expenses 13,134 5,027 24,231 9,571  
Income before provision for (benefit from) income taxes 13,721 9,551 23,850 21,218  
Total assets at end of quarter 2,665,396 719,756 2,665,396 719,756  
Correspondent Production [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 0 0 0 0  
Management fees 0 0 0 0  
Loan fulfillment fees $ 5,814 $ 4,427 $ 11,104 $ 8,443