v3.26.1
Fair Value - Summary of Financial Statement Items Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2032
Jun. 30, 2031
Jun. 30, 2030
Jun. 30, 2029
Jun. 30, 2028
Jun. 30, 2027
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
 [1]
Mar. 31, 2025
Dec. 31, 2024
Assets:                        
Short-term investments             $ 195,612   $ 190,518      
Mortgage-backed securities             4,075,660   4,452,859      
Loans held for sale             3,195,343   2,699,398      
Mortgage servicing rights             3,575,603 [1] $ 3,623,979 3,644,702 $ 3,739,106 $ 3,770,034 $ 3,867,394
Liabilities:                        
Interest-only security payable at fair value $ 34,299 $ 0 $ 0 $ 0 $ 0 $ 0 34,299   37,650      
Derivative and credit risk transfer strip liabilities:                        
Total derivative and credit risk transfer strip liabilities             9,047   6,932      
PennyMac Financial Services, Inc. [Member]                        
Assets:                        
Derivative assets             5,267   6,389      
Derivative assets, Netting             (28)   (142)      
Total derivative assets after netting             5,239   6,247      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             1,262   2,399      
Derivative liabilities, Netting             (28)   (142)      
Total derivative liabilities after netting             1,234   2,257      
PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member]                        
Assets:                        
Derivative assets             4,179   4,605      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             1,234   2,257      
PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member]                        
Assets:                        
Derivative assets             1,088   1,784      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             28   142      
Nonaffiliates [Member]                        
Assets:                        
Derivative assets             55,071   44,551      
Derivative assets, Netting             (10,887)   5,145      
Total derivative assets after netting             44,184   49,696      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             14,477   17,498      
Derivative liabilities, Netting             (10,858)   (16,565)      
Total derivative liabilities after netting             3,619   933      
Total derivative and credit risk transfer strip liabilities             9,047   6,932      
Nonaffiliates [Member] | Credit Risk Transfer / CRT Derivatives [Member]                        
Assets:                        
Derivative assets [2]             30,301   32,659      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities [2]             0   0      
Nonaffiliates [Member] | Forward Purchase Contracts [Member]                        
Assets:                        
Derivative assets [2]             500   4,113      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities [2]             42   158      
Nonaffiliates [Member] | Forward Sale Contracts [Member]                        
Assets:                        
Derivative assets [2]             3,769   2,381      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities [2]             14,435   17,340      
Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member]                        
Assets:                        
Derivative assets [2]             0   1,289      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities [2]             0   0      
Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member]                        
Assets:                        
Derivative assets [2]             6,410   4,109      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities [2]             0   0      
Recurring [Member]                        
Assets:                        
Short-term investments             195,612   190,518      
Mortgage-backed securities             4,075,660   4,452,859      
Loans held for sale             3,195,343   2,699,398      
Loans held for investment             12,458,249   8,532,644      
Total Assets             23,549,890   19,576,064      
Mortgage servicing rights             3,575,603   3,644,702      
Liabilities:                        
Asset-backed financings of the variable interest entities             11,358,602   7,789,303      
Interest-only security payable at fair value             34,299   37,650      
Derivative and credit risk transfer strip liabilities:                        
Total liabilities             11,403,182   7,836,142      
Recurring [Member] | Level 1 [Member]                        
Assets:                        
Short-term investments             195,612   190,518      
Mortgage-backed securities             0   0      
Loans held for sale             0   0      
Loans held for investment             0   0      
Total Assets             202,022   195,916      
Mortgage servicing rights             0   0      
Liabilities:                        
Asset-backed financings of the variable interest entities             0   0      
Interest-only security payable at fair value                 0      
Derivative and credit risk transfer strip liabilities:                        
Total liabilities             0   0      
Recurring [Member] | Level 2 [Member]                        
Assets:                        
Short-term investments                 0      
Mortgage-backed securities             4,006,726   4,380,357      
Loans held for sale             3,193,032   2,695,817      
Loans held for investment             12,456,657   8,530,939      
Total Assets             19,675,863   15,615,391      
Mortgage servicing rights             0   0      
Liabilities:                        
Asset-backed financings of the variable interest entities             11,358,602   7,789,303      
Interest-only security payable at fair value                 0      
Derivative and credit risk transfer strip liabilities:                        
Total liabilities             11,373,107   7,806,943      
Recurring [Member] | Level 3 [Member]                        
Assets:                        
Short-term investments                 0      
Mortgage-backed securities             68,934   72,502      
Loans held for sale             2,311   3,581      
Loans held for investment             1,592   1,705      
Total Assets             3,682,920   3,759,754      
Mortgage servicing rights             3,575,603   3,644,702      
Liabilities:                        
Asset-backed financings of the variable interest entities             0   0      
Interest-only security payable at fair value             34,299   37,650      
Derivative and credit risk transfer strip liabilities:                        
Total liabilities             40,961   45,906      
Recurring [Member] | PennyMac Financial Services, Inc. [Member]                        
Assets:                        
Derivative assets             5,267   6,389      
Derivative assets, Netting             (28)   (142)      
Total derivative assets after netting             5,239   6,247      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             1,262   2,399      
Derivative liabilities, Netting             (28)   (142)      
Total derivative liabilities after netting             1,234   2,257      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative assets, Netting             0   0      
Total derivative assets after netting             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Derivative liabilities, Netting             0   0      
Total derivative liabilities after netting             0   0      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             1,088   1,784      
Derivative assets, Netting             0   0      
Total derivative assets after netting             1,088   1,784      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             28   142      
Derivative liabilities, Netting             0   0      
Total derivative liabilities after netting             28   142      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             4,179   4,605      
Derivative assets, Netting             0   0      
Total derivative assets after netting             4,179   4,605      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             1,234   2,257      
Derivative liabilities, Netting             0   0      
Total derivative liabilities after netting             1,234   2,257      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member]                        
Assets:                        
Derivative assets             4,179   4,605      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             1,234   2,257      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             4,179   4,605      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             1,234   2,257      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member]                        
Assets:                        
Derivative assets             1,088   1,784      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             28   142      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             1,088   1,784      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             28   142      
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member]                        
Assets:                        
Derivative assets             55,071   44,551      
Derivative assets, Netting             (10,887)   5,145      
Total derivative assets after netting             44,184   49,696      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             14,477   17,498      
Derivative liabilities, Netting             (10,858)   (16,565)      
Total derivative liabilities after netting             3,619   933      
Total derivative and credit risk transfer strip liabilities             9,047   6,932      
Recurring [Member] | Nonaffiliates [Member] | Credit Risk Transfer Strips [Member]                        
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             5,428   5,999      
Recurring [Member] | Nonaffiliates [Member] | Credit Risk Transfer / CRT Derivatives [Member]                        
Assets:                        
Derivative assets             30,301   32,659      
Recurring [Member] | Nonaffiliates [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             6,410   5,398      
Derivative assets, Netting             0          
Total derivative assets after netting             6,410   5,398      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Derivative liabilities, Netting             0   0      
Total derivative liabilities after netting             0   0      
Total derivative and credit risk transfer strip liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Level 1 [Member] | Credit Risk Transfer Strips [Member]                        
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Level 1 [Member] | Credit Risk Transfer / CRT Derivatives [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities, Netting                 0      
Recurring [Member] | Nonaffiliates [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             18,360   6,494      
Derivative assets, Netting             0          
Total derivative assets after netting             18,360   6,494      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             14,477   17,498      
Derivative liabilities, Netting             0   0      
Total derivative liabilities after netting             14,477   17,498      
Total derivative and credit risk transfer strip liabilities             14,477   17,498      
Recurring [Member] | Nonaffiliates [Member] | Level 2 [Member] | Credit Risk Transfer Strips [Member]                        
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Level 2 [Member] | Credit Risk Transfer / CRT Derivatives [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities, Netting                 0      
Recurring [Member] | Nonaffiliates [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             30,301   32,659      
Derivative assets, Netting             0          
Total derivative assets after netting             30,301   32,659      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Derivative liabilities, Netting             0   0      
Total derivative liabilities after netting             0   0      
Total derivative and credit risk transfer strip liabilities             5,428   5,999      
Recurring [Member] | Nonaffiliates [Member] | Level 3 [Member] | Credit Risk Transfer Strips [Member]                        
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             5,428   5,999      
Recurring [Member] | Nonaffiliates [Member] | Level 3 [Member] | Credit Risk Transfer / CRT Derivatives [Member]                        
Assets:                        
Derivative assets             30,301   32,659      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities, Netting                 0      
Recurring [Member] | Nonaffiliates [Member] | Forward Purchase Contracts [Member]                        
Assets:                        
Derivative assets             500   4,113      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             42   158      
Recurring [Member] | Nonaffiliates [Member] | Forward Purchase Contracts [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Forward Purchase Contracts [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             500   4,113      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             42   158      
Recurring [Member] | Nonaffiliates [Member] | Forward Purchase Contracts [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Forward Sale Contracts [Member]                        
Assets:                        
Derivative assets             3,769   2,381      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             14,435   17,340      
Recurring [Member] | Nonaffiliates [Member] | Forward Sale Contracts [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Forward Sale Contracts [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             3,769   2,381      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             14,435   17,340      
Recurring [Member] | Nonaffiliates [Member] | Forward Sale Contracts [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             0   0      
Derivative and credit risk transfer strip liabilities:                        
Derivative liabilities             0   0      
Recurring [Member] | Nonaffiliates [Member] | Swaptions                        
Assets:                        
Derivative assets             14,091          
Recurring [Member] | Nonaffiliates [Member] | Swaptions | Level 1 [Member]                        
Assets:                        
Derivative assets             0          
Recurring [Member] | Nonaffiliates [Member] | Swaptions | Level 2 [Member]                        
Assets:                        
Derivative assets             14,091          
Recurring [Member] | Nonaffiliates [Member] | Swaptions | Level 3 [Member]                        
Assets:                        
Derivative assets             0          
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member]                        
Assets:                        
Derivative assets                 1,289      
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets                 1,289      
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets                 0      
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets                 0      
Recurring [Member] | Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member]                        
Assets:                        
Derivative assets             6,410   4,109      
Recurring [Member] | Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member] | Level 1 [Member]                        
Assets:                        
Derivative assets             6,410   4,109      
Recurring [Member] | Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member] | Level 2 [Member]                        
Assets:                        
Derivative assets             0   0      
Recurring [Member] | Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member] | Level 3 [Member]                        
Assets:                        
Derivative assets             $ 0   $ 0      
[1] During June 2026, the Company entered into an agreement to sell a portfolio of conventional MSRs with an aggregate UPB of approximately $13.0 billion. The transaction is expected to close in August 2026.
[2] All hedging derivatives are interest rate derivatives that are used as economic hedges.