Derivative Financial Instruments - Offsetting of Derivative Assets - Offsetting of Derivative and Financial Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivatives: Subject to master netting arrangements:
Netting	$ (190,358)	$ (32,096)
Total.
Gross amounts of recognized liabilities	315,845	54,702
Net amounts of liabilities presented in the consolidated balance sheet	125,487	22,606
Mortgage loans sold under agreements to repurchase
Net amounts of liabilities presented in the consolidated balance sheet	3,490,082
Debt Issuance Costs
Net amount of liabilities in the consolidated balance sheet	3,487,335	7,292,735
Total
Net amounts of liabilities presented in the consolidated balance sheet	3,615,569	7,319,966
Net amount of liabilities in the consolidated balance sheet	125,487	22,606
Loan Repo Facility
Mortgage loans sold under agreements to repurchase
Net amounts of liabilities presented in the consolidated balance sheet	3,490,082	7,297,360
Debt Issuance Costs
Debt issuance costs	(2,747)	(4,625)
Net amount of liabilities in the consolidated balance sheet	3,487,335	7,292,735
Forward contracts | Purchases
Total.
Gross amounts of recognized liabilities	226,369	18,007
Forward contracts | Sales
Total.
Gross amounts of recognized liabilities	8,819	35,415
Interest rate lock commitments
Total
Net amounts of liabilities presented in the consolidated balance sheet	68,398	1,280
Net amount of liabilities in the consolidated balance sheet	68,398	$ 1,280
MBS call options
Total.
Gross amounts of recognized liabilities	118
Put options on Eurodollar futures | Sales
Total.
Gross amounts of recognized liabilities	11,766
Call options on Eurodollar futures | Sales
Total.
Gross amounts of recognized liabilities	$ 375