v3.26.1
Segments - Financial Highlights by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Net investment income:          
Net loan servicing fees $ 40,041 $ 23,947 $ 123,627 $ (3,263)  
Net gains on loans held for sale 15,292 17,806 38,202 30,150  
Net gains (losses) on investments and financings          
Mortgage-backed securities 426 14,564 (32,981) 79,419  
Loans held for investment 12,164 (1,134) 8,597 (1,876)  
Credit risk transfer arrangements 9,711 20,250 23,622 18,450  
Net (losses) gains on investments and financings 22,301 33,680 (762) 95,993  
Net interest expense:          
Interest income 304,250 196,481 580,341 372,572  
Interest expense 311,345 205,149 591,095 387,286  
Net interest expense (7,095) (8,668) (10,754) (14,714)  
Other 2,190 3,436 4,550 6,500  
Net investment income 72,729 70,201 154,863 114,666  
Expenses:          
Professional services 11,627 8,362 25,128 15,344  
Compensation 3,390 2,836 6,366 5,806  
Loan collection and liquidation 1,680 2,385 3,804 4,354  
Safekeeping 931 1,228 1,786 2,338  
Loan origination 14 666 227 1,352  
Other 6,794 3,390 10,142 6,406  
Total expenses 55,909 53,195 111,148 103,959  
Income before (benefit from) provision for income taxes 16,820 17,006 43,715 10,707  
Total assets at end of quarter 25,093,590 16,801,119 25,093,590 16,801,119 $ 21,346,882
PennyMac Financial Services, Inc. [Member]          
Net investment income:          
Net gains on loans held for sale 0 2,658 0 4,673  
Expenses:          
Loan servicing fees 19,640 21,645 39,363 43,374  
Management fees 6,810 6,869 13,572 13,881  
Loan fulfillment fees 5,023 5,814 10,760 11,104  
Reportable Segment [Member]          
Net investment income:          
Net loan servicing fees 40,041 23,947 123,627 (3,263)  
Net gains on loans held for sale 15,292 17,806 38,202 30,150  
Net gains (losses) on investments and financings          
Mortgage-backed securities 426 14,564 (32,981) 79,419  
Loans held for investment 12,164 (1,134) 8,597 (1,876)  
Credit risk transfer arrangements 9,711 20,250 23,622 18,450  
Net (losses) gains on investments and financings 22,301 33,680 (762) 95,993  
Net interest expense:          
Interest income 301,721 194,350 575,111 366,993  
Interest expense 309,288 203,711 587,126 384,682  
Net interest expense (7,567) (9,361) (12,015) (17,689)  
Other 2,190 3,436 4,550 6,500  
Net investment income 72,257 69,508 153,602 111,691  
Expenses:          
Professional services 9,249 6,381 20,093 11,261  
Compensation 0 0 0 0  
Loan collection and liquidation 1,680 2,385 3,804 4,354  
Safekeeping 931 1,228 1,786 2,338  
Loan origination 14 666 227 1,352  
Other 4,352 722 5,333 1,479  
Total expenses 40,889 38,841 81,366 75,262  
Income before (benefit from) provision for income taxes 31,368 30,667 72,236 36,429  
Total assets at end of quarter 24,669,777 16,329,474 24,669,777 16,329,474  
Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 19,640 21,645 39,363 43,374  
Management fees 0 0 0 0  
Loan fulfillment fees 5,023 5,814 10,760 11,104  
Corporate [Member]          
Net investment income:          
Net loan servicing fees 0 0 0 0  
Net gains on loans held for sale 0 0 0 0  
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 (losses) gains on investments and financings 0 0 0 0  
Net interest expense:          
Interest income 2,529 2,131 5,230 5,579  
Interest expense 2,057 1,438 3,969 2,604  
Net interest expense 472 693 1,261 2,975  
Other 0 0 0 0  
Net investment income 472 693 1,261 2,975  
Expenses:          
Professional services 2,378 1,981 5,035 4,083  
Compensation 3,390 2,836 6,366 5,806  
Loan collection and liquidation 0 0 0 0  
Safekeeping 0 0 0 0  
Loan origination 0 0 0 0  
Other 2,442 2,668 4,809 4,927  
Total expenses 15,020 14,354 29,782 28,697  
Income before (benefit from) provision for income taxes (14,548) (13,661) (28,521) (25,722)  
Total assets at end of quarter 423,813 471,645 423,813 471,645  
Corporate [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 0 0 0 0  
Management fees 6,810 6,869 13,572 13,881  
Loan fulfillment fees 0 0 0 0  
Credit Sensitive Strategies [Member] | Reportable Segment [Member]          
Net investment income:          
Net loan servicing fees 0 0 0 0  
Net gains on loans held for sale 0 0 0 0  
Net gains (losses) on investments and financings          
Mortgage-backed securities (8) 506 (8) (504)  
Loans held for investment 211 (958) 2,401 1,809  
Credit risk transfer arrangements 9,711 20,250 23,622 18,450  
Net (losses) gains on investments and financings 9,914 19,798 26,015 19,755  
Net interest expense:          
Interest income 21,547 20,971 40,777 40,520  
Interest expense 20,086 18,824 38,813 36,942  
Net interest expense 1,461 2,147 1,964 3,578  
Other (61) 0 (109) (142)  
Net investment income 11,314 21,945 27,870 23,191  
Expenses:          
Professional services 0 0 0 0  
Compensation 0 0 0 0  
Loan collection and liquidation 2 20 19 63  
Safekeeping 0 0 0 0  
Loan origination 0 0 0 0  
Other 63 89 140 182  
Total expenses 66 111 161 249  
Income before (benefit from) provision for income taxes 11,248 21,834 27,709 22,942  
Total assets at end of quarter 1,852,215 1,581,220 1,852,215 1,581,220  
Credit Sensitive Strategies [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 1 2 2 4  
Management fees 0 0 0 0  
Loan fulfillment fees 0 0 0 0  
Interest Rate Sensitive Strategies [Member] | Reportable Segment [Member]          
Net investment income:          
Net loan servicing fees 40,041 23,947 123,627 (3,263)  
Net gains on loans held for sale 0 0 0 0  
Net gains (losses) on investments and financings          
Mortgage-backed securities 434 14,058 (32,973) 79,923  
Loans held for investment 11,953 (176) 6,196 (3,685)  
Credit risk transfer arrangements 0 0 0 0  
Net (losses) gains on investments and financings 12,387 13,882 (26,777) 76,238  
Net interest expense:          
Interest income 236,693 137,493 451,323 257,389  
Interest expense 256,741 154,614 484,298 289,945  
Net interest expense (20,048) (17,121) (32,975) (32,556)  
Other 0 0 0 0  
Net investment income 32,380 20,708 63,875 40,419  
Expenses:          
Professional services 0 0 0 0  
Compensation 0 0 0 0  
Loan collection and liquidation 1,678 2,365 3,785 4,291  
Safekeeping 891 1,144 1,693 2,178  
Loan origination 0 0 0 0  
Other 1,181 444 2,055 943  
Total expenses 23,389 25,596 46,894 50,782  
Income before (benefit from) provision for income taxes 8,991 (4,888) 16,981 (10,363)  
Total assets at end of quarter 19,556,028 12,082,858 19,556,028 12,082,858  
Interest Rate Sensitive Strategies [Member] | Reportable Segment [Member] | PennyMac Financial Services, Inc. [Member]          
Expenses:          
Loan servicing fees 19,639 21,643 39,361 43,370  
Management fees 0 0 0 0  
Loan fulfillment fees 0 0 0 0  
Aggregation and Securitization [Member] | Reportable Segment [Member]          
Net investment income:          
Net loan servicing fees 0 0 0 0  
Net gains on loans held for sale 15,292 17,806 38,202 30,150  
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 (losses) gains on investments and financings 0 0 0 0  
Net interest expense:          
Interest income 43,481 35,886 83,011 69,084  
Interest expense 32,461 30,273 64,015 57,795  
Net interest expense 11,020 5,613 18,996 11,289  
Other 2,251 3,436 4,659 6,642  
Net investment income 28,563 26,855 61,857 48,081  
Expenses:          
Professional services 9,249 6,381 20,093 11,261  
Compensation 0 0 0 0  
Loan collection and liquidation 0 0 0 0  
Safekeeping 40 84 93 160  
Loan origination 14 666 227 1,352  
Other 3,108 189 3,138 354  
Total expenses 17,434 13,134 34,311 24,231  
Income before (benefit from) provision for income taxes 11,129 13,721 27,546 23,850  
Total assets at end of quarter 3,261,534 2,665,396 3,261,534 2,665,396  
Aggregation and Securitization [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 $ 5,023 $ 5,814 $ 10,760 $ 11,104