Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Assets, Financial Assets, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Total
Net amounts of assets presented in the balance sheet	$ 276,709	$ 185,518
Net amount	276,709	185,518
RJ O' Brien
Total
Net amounts of assets presented in the balance sheet	51,102	24,855
Net amount	51,102	24,855
Morgan Stanley Bank, N.A.
Total
Net amounts of assets presented in the balance sheet	44,316	10,673
Net amount	44,316	10,673
Goldman Sachs
Total
Net amounts of assets presented in the balance sheet	15,291	1,769
Net amount	15,291	1,769
Santander US Capital Markets LLC
Total
Net amounts of assets presented in the balance sheet	7,371	1,723
Net amount	7,371	1,723
Bank of America, N.A.
Total
Net amounts of assets presented in the balance sheet	5,039
Net amount	5,039
Ellington Management
Total
Net amounts of assets presented in the balance sheet	4,665
Net amount	4,665
Federal National Mortgage Association
Total
Net amounts of assets presented in the balance sheet	2,261
Net amount	2,261
Barclays Capital
Total
Net amounts of assets presented in the balance sheet		3,919
Net amount		3,919
Bank of Montreal
Total
Net amounts of assets presented in the balance sheet		2,676
Net amount		2,676
Others
Total
Net amounts of assets presented in the balance sheet	8,633	8,367
Net amount	8,633	8,367
PennyMac Mortgage Investment Trust
Total
Net amounts of assets presented in the balance sheet	5,886	2,257
Net amount	5,886	2,257
Interest rate lock commitments
Total
Net amounts of assets presented in the balance sheet	138,031	131,536
Net amount	$ 138,031	$ 131,536