Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Assets, Financial Assets, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Total
Net amounts of assets presented in the balance sheet	$ 200,447	$ 185,518
Net amount	200,447	185,518
RJ O' Brien
Total
Net amounts of assets presented in the balance sheet	21,453	24,855
Net amount	21,453	24,855
Citibank, N.A.
Total
Net amounts of assets presented in the balance sheet	13,471	638
Net amount	13,471	638
JP Morgan Chase Bank
Total
Net amounts of assets presented in the balance sheet	9,406	933
Net amount	9,406	933
Morgan Stanley Bank, N.A.
Total
Net amounts of assets presented in the balance sheet		10,673
Net amount		10,673
Goldman Sachs
Total
Net amounts of assets presented in the balance sheet	1,836	1,769
Net amount	1,836	1,769
Santander US Capital Markets LLC
Total
Net amounts of assets presented in the balance sheet		1,723
Net amount		1,723
Barclays Capital
Total
Net amounts of assets presented in the balance sheet	3,448	3,919
Net amount	3,448	3,919
Bank of Montreal
Total
Net amounts of assets presented in the balance sheet	1,469	2,676
Net amount	1,469	2,676
Others
Total
Net amounts of assets presented in the balance sheet	4,269	6,796
Net amount	4,269	6,796
PennyMac Mortgage Investment Trust
Total
Net amounts of assets presented in the balance sheet	1,234	2,257
Net amount	1,234	2,257
Interest rate lock commitments
Total
Net amounts of assets presented in the balance sheet	145,095	131,536
Net amount	$ 145,095	$ 131,536