v3.26.1
Derivative Financial Instruments - Other Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative assets:          
Derivative asset, before netting $ 257,945   $ 257,945   $ 222,297
Netting (57,498)   (57,498)   (36,779)
Total derivative assets 200,447   200,447   185,518
Derivative liabilities:          
Derivative liability, before netting 77,224   77,224   54,797
Netting (42,661)   (42,661)   (45,238)
Net amounts of liabilities presented in the consolidated balance sheet 34,563   34,563   9,559
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Gains (losses) recognized on derivative financial instruments (185,581) $ (109,102) (392,868) $ (2,328)  
Interest rate lock commitments and loans held for sale          
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Gains (losses) recognized on derivative financial instruments (59,010) (28,853) 42,460 (173,899)  
Mortgage servicing rights          
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Gains (losses) recognized on derivative financial instruments (182,495) (116,294) (389,743) (27,654)  
PennyMac Mortgage Investment Trust          
Derivative assets:          
Derivative asset, before netting 1,262   1,262   2,399
Netting (28)   (28)   (142)
Total derivative assets 1,234   1,234   2,257
Derivative liabilities:          
Derivative liability, before netting 5,267   5,267   6,389
Netting (28)   (28)   (142)
Net amounts of liabilities presented in the consolidated balance sheet 5,239   5,239   6,247
Margin Deposits          
Derivative assets:          
Collateral (received from) placed with derivative counterparties (14,837)   (14,837)   8,459
Interest rate lock commitments          
Derivative assets:          
Total derivative assets 145,095   145,095   131,536
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Gains (losses) recognized on derivative financial instruments 32,326 $ 32,211 13,335 $ 108,588  
Forward contracts | Purchases          
Derivative Instruments          
Notional amount 10,704,164   10,704,164   14,311,234
Derivative assets:          
Derivative asset, before netting 10,230   10,230   49,499
Derivative liabilities:          
Derivative liability, before netting 9,736   9,736   2,845
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     14,311,234    
Balance at end of period 10,704,164   10,704,164    
Forward contracts | Sales          
Derivative Instruments          
Notional amount 17,273,500   17,273,500   22,291,811
Derivative assets:          
Derivative asset, before netting 15,879   15,879   16,399
Derivative liabilities:          
Derivative liability, before netting 46,426   46,426   47,692
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     22,291,811    
Balance at end of period 17,273,500   17,273,500    
Forward contracts | Sales | PennyMac Mortgage Investment Trust          
Derivative Instruments          
Notional amount 125,582   125,582   250,638
Derivative assets:          
Derivative asset, before netting 28   28   142
Derivative liabilities:          
Derivative liability, before netting 1,088   1,088   1,784
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     250,638    
Balance at end of period 125,582   125,582    
MBS put options          
Derivative Instruments          
Notional amount 500,000   500,000    
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at end of period 500,000   500,000    
Total return swap          
Derivative Instruments          
Notional amount 39,998   39,998   39,998
Derivative assets:          
Derivative asset, before netting 136   136   8
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     39,998    
Balance at end of period 39,998   39,998    
Put options on Eurodollar futures | Purchases          
Derivative Instruments          
Notional amount 11,250,000   11,250,000   12,625,000
Derivative assets:          
Derivative asset, before netting 21,453   21,453   22,769
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     12,625,000    
Balance at end of period 11,250,000   11,250,000    
Call options on Eurodollar futures | Purchases          
Derivative Instruments          
Notional amount         7,750,000
Derivative assets:          
Derivative asset, before netting         2,086
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     7,750,000    
Treasury future | Purchases          
Derivative Instruments          
Notional amount 20,226,500   20,226,500   11,841,400
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     11,841,400    
Balance at end of period 20,226,500   20,226,500    
Treasury future | Sales          
Derivative Instruments          
Notional amount 20,165,000   20,165,000   8,607,100
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     8,607,100    
Balance at end of period 20,165,000   20,165,000    
Interest rate swap futures          
Derivative Instruments          
Notional amount 5,000,000   5,000,000    
Derivative assets:          
Derivative asset, before netting 65,152   65,152    
Derivative liabilities:          
Derivative liability, before netting 17,175   17,175    
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at end of period 5,000,000   5,000,000    
Not designated as hedging instrument | Interest rate lock commitments          
Derivative Instruments          
Notional amount 12,053,063   12,053,063   13,474,638
Derivative assets:          
Derivative asset, before netting 145,095   145,095   131,536
Derivative liabilities:          
Derivative liability, before netting 3,887   3,887   4,260
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     13,474,638    
Balance at end of period 12,053,063   12,053,063    
Not designated as hedging instrument | Interest rate lock commitments | PennyMac Mortgage Investment Trust          
Derivative Instruments          
Notional amount 1,049,341   1,049,341   1,207,859
Derivative assets:          
Derivative asset, before netting 1,234   1,234   2,257
Derivative liabilities:          
Derivative liability, before netting 4,179   4,179   $ 4,605
Activity for derivative contracts used to hedge the IRLCs and inventory of mortgage loans at notional value          
Balance at beginning of period     1,207,859    
Balance at end of period $ 1,049,341   $ 1,049,341