v3.26.1
Fair Value - Summary of Financial Statement Items Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2032
Mar. 31, 2031
Mar. 31, 2030
Mar. 31, 2029
Mar. 31, 2028
Mar. 31, 2027
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Assets:                    
Short-term investments             $ 187,689 $ 190,518    
Mortgage-backed securities             3,765,539 4,452,859    
Loans held for sale             2,349,895 2,699,398    
Mortgage servicing rights             3,623,979 3,644,702 $ 3,770,034 $ 3,867,394
Liabilities:                    
Interest-only security payable at fair value $ 34,232 $ 0 $ 0 $ 0 $ 0 $ 0 34,232 37,650    
Derivative and credit risk transfer strip liabilities:                    
Total derivative and credit risk transfer strip liabilities             21,329 6,932    
PennyMac Financial Services, Inc. [Member]                    
Assets:                    
Derivative assets             3,838 6,389    
Derivative assets, Netting             (15) (142)    
Total derivative assets after netting             3,823 6,247    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             5,901 2,399    
Derivative liabilities, Netting             (15) (142)    
Total derivative liabilities after netting             5,886 2,257    
PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member]                    
Assets:                    
Derivative assets             2,613 4,605    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             5,886 2,257    
PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member]                    
Assets:                    
Derivative assets             1,225 1,784    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             15 142    
Nonaffiliates [Member]                    
Assets:                    
Derivative assets             76,623 44,551    
Derivative assets, Netting             (25,857) 5,145    
Total derivative assets after netting             50,766 49,696    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             20,413 17,498    
Derivative liabilities, Netting             (3,146) (16,565)    
Total derivative liabilities after netting             17,267 933    
Total derivative and credit risk transfer strip liabilities             21,329 6,932    
Nonaffiliates [Member] | Credit Risk Transfer / CRT Derivatives [Member]                    
Assets:                    
Derivative assets [1]             30,174 32,659    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities [1]             0 0    
Nonaffiliates [Member] | Forward Purchase Contracts [Member]                    
Assets:                    
Derivative assets [1]             1,492 4,113    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities [1]             8,491 158    
Nonaffiliates [Member] | Forward Sales Contracts [Member]                    
Assets:                    
Derivative assets [1]             31,957 2,381    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities [1]             11,922 17,340    
Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member]                    
Assets:                    
Derivative assets [1]             2,141 1,289    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities [1]             0 0    
Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member]                    
Assets:                    
Derivative assets [1]             10,859 4,109    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities [1]             0 0    
Recurring [Member]                    
Assets:                    
Short-term investments             187,689 190,518    
Mortgage-backed securities             3,765,539 4,452,859    
Loans held for sale             2,349,895 2,699,398    
Loans held for investment             10,867,942 8,532,644    
Total Assets             20,849,633 19,576,064    
Mortgage servicing rights             3,623,979 3,644,702    
Liabilities:                    
Asset-backed financings of the variable interest entities             9,903,515 7,789,303    
Interest-only security payable at fair value             34,232 37,650    
Derivative and credit risk transfer strip liabilities:                    
Total liabilities             9,964,962 7,836,142    
Recurring [Member] | Level 1 [Member]                    
Assets:                    
Short-term investments             187,689 190,518    
Mortgage-backed securities             0 0    
Loans held for sale             0 0    
Loans held for investment             0 0    
Total Assets             200,689 195,916    
Mortgage servicing rights             0 0    
Liabilities:                    
Asset-backed financings of the variable interest entities             0 0    
Interest-only security payable at fair value             0 0    
Derivative and credit risk transfer strip liabilities:                    
Total liabilities             0 0    
Recurring [Member] | Level 2 [Member]                    
Assets:                    
Short-term investments             0 0    
Mortgage-backed securities             3,694,110 4,380,357    
Loans held for sale             2,347,811 2,695,817    
Loans held for investment             10,866,292 8,530,939    
Total Assets             16,942,887 15,615,391    
Mortgage servicing rights             0 0    
Liabilities:                    
Asset-backed financings of the variable interest entities             9,903,515 7,789,303    
Interest-only security payable at fair value             0 0    
Derivative and credit risk transfer strip liabilities:                    
Total liabilities             9,923,943 7,806,943    
Recurring [Member] | Level 3 [Member]                    
Assets:                    
Short-term investments             0 0    
Mortgage-backed securities             71,429 72,502    
Loans held for sale             2,084 3,581    
Loans held for investment             1,650 1,705    
Total Assets             3,731,929 3,759,754    
Mortgage servicing rights             3,623,979 3,644,702    
Liabilities:                    
Asset-backed financings of the variable interest entities             0 0    
Interest-only security payable at fair value             34,232 37,650    
Derivative and credit risk transfer strip liabilities:                    
Total liabilities             44,180 45,906    
Recurring [Member] | PennyMac Financial Services, Inc. [Member]                    
Assets:                    
Derivative assets             3,838 6,389    
Derivative assets, Netting             (15) (142)    
Total derivative assets after netting             3,823 6,247    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             5,901 2,399    
Derivative liabilities, Netting             (15) (142)    
Total derivative liabilities after netting             5,886 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             1,225 1,784    
Derivative assets, Netting             0 0    
Total derivative assets after netting             1,225 1,784    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             15 142    
Derivative liabilities, Netting             0 0    
Total derivative liabilities after netting             15 142    
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Level 3 [Member]                    
Assets:                    
Derivative assets             2,613 4,605    
Derivative assets, Netting             0 0    
Total derivative assets after netting             2,613 4,605    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             5,886 2,257    
Derivative liabilities, Netting             0 0    
Total derivative liabilities after netting             5,886 2,257    
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Interest Rate Lock Commitments with PFSI [Member]                    
Assets:                    
Derivative assets             2,613 4,605    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             5,886 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             2,613 4,605    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             5,886 2,257    
Recurring [Member] | PennyMac Financial Services, Inc. [Member] | Forward Purchase Contracts [Member]                    
Assets:                    
Derivative assets             1,225 1,784    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             15 142    
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             1,225 1,784    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             15 142    
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             76,623 44,551    
Derivative assets, Netting             (25,857) 5,145    
Total derivative assets after netting             50,766 49,696    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             20,413 17,498    
Derivative liabilities, Netting             (3,146) (16,565)    
Total derivative liabilities after netting             17,267 933    
Total derivative and credit risk transfer strip liabilities             21,329 6,932    
Recurring [Member] | Nonaffiliates [Member] | Credit Risk Transfer Strips [Member]                    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             4,062 5,999    
Recurring [Member] | Nonaffiliates [Member] | Credit Risk Transfer / CRT Derivatives [Member]                    
Assets:                    
Derivative assets             30,174 32,659    
Recurring [Member] | Nonaffiliates [Member] | Level 1 [Member]                    
Assets:                    
Derivative assets             13,000 5,398    
Derivative assets, Netting             0      
Total derivative assets after netting             13,000 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             33,449 6,494    
Derivative assets, Netting             0      
Total derivative assets after netting             33,449 6,494    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             20,413 17,498    
Derivative liabilities, Netting             0 0    
Total derivative liabilities after netting             20,413 17,498    
Total derivative and credit risk transfer strip liabilities             20,413 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             30,174 32,659    
Derivative assets, Netting             0      
Total derivative assets after netting             30,174 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             4,062 5,999    
Recurring [Member] | Nonaffiliates [Member] | Level 3 [Member] | Credit Risk Transfer Strips [Member]                    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             4,062 5,999    
Recurring [Member] | Nonaffiliates [Member] | Level 3 [Member] | Credit Risk Transfer / CRT Derivatives [Member]                    
Assets:                    
Derivative assets             30,174 32,659    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities, Netting               0    
Recurring [Member] | Nonaffiliates [Member] | Forward Purchase Contracts [Member]                    
Assets:                    
Derivative assets             1,492 4,113    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             8,491 158    
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             1,492 4,113    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             8,491 158    
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 Sales Contracts [Member]                    
Assets:                    
Derivative assets             31,957 2,381    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             11,922 17,340    
Recurring [Member] | Nonaffiliates [Member] | Forward Sales 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 Sales Contracts [Member] | Level 2 [Member]                    
Assets:                    
Derivative assets             31,957 2,381    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             11,922 17,340    
Recurring [Member] | Nonaffiliates [Member] | Forward Sales Contracts [Member] | Level 3 [Member]                    
Assets:                    
Derivative assets             0 0    
Derivative and credit risk transfer strip liabilities:                    
Derivative liabilities             0 0    
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member]                    
Assets:                    
Derivative assets             2,141 1,289    
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member] | Level 1 [Member]                    
Assets:                    
Derivative assets             2,141 1,289    
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member] | Level 2 [Member]                    
Assets:                    
Derivative assets             0 0    
Recurring [Member] | Call Options on Interest Rate Futures Purchase Contracts [Member] | Nonaffiliates [Member] | Level 3 [Member]                    
Assets:                    
Derivative assets             0 0    
Recurring [Member] | Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member]                    
Assets:                    
Derivative assets             10,859 4,109    
Recurring [Member] | Put Options On Interest Rate Futures Purchase Contracts | Nonaffiliates [Member] | Level 1 [Member]                    
Assets:                    
Derivative assets             10,859 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] All hedging derivatives are interest rate derivatives that are used as economic hedges.