Derivative Financial Instruments - Offsetting of Derivative Assets - Offsetting of Derivative and Financial Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives: Subject to master netting arrangements:
Netting	$ (5,651)	$ (48,591)
Total.
Gross amounts of recognized liabilities	46,435	101,866
Net amounts of liabilities presented in the consolidated balance sheet	40,784	53,275
Mortgage loans sold under agreements to repurchase
Net amounts of liabilities presented in the consolidated balance sheet	5,441,126
Debt Issuance Costs
Net amount of liabilities in the consolidated balance sheet	5,435,354	3,763,956
Total
Net amounts of liabilities presented in the consolidated balance sheet	5,481,910	3,822,724
Net amount of liabilities in the consolidated balance sheet	40,784	53,275
Loan Repo Facility
Mortgage loans sold under agreements to repurchase
Net amounts of liabilities presented in the consolidated balance sheet	5,441,126	3,769,449
Debt Issuance Costs
Debt issuance costs	(5,772)	(5,493)
Net amount of liabilities in the consolidated balance sheet	5,435,354	3,763,956
Forward contracts | Purchases
Total.
Gross amounts of recognized liabilities	6,049	5,141
Forward contracts | Sales
Total.
Gross amounts of recognized liabilities	35,649	92,796
Interest rate lock commitments
Total
Net amounts of liabilities presented in the consolidated balance sheet	4,737	720
Net amount of liabilities in the consolidated balance sheet	$ 4,737	720
Call options on Eurodollar futures | Purchases
Total.
Gross amounts of recognized liabilities		$ 3,209