Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Liabilities [Abstract]
Payable for unsettled residential whole loans and Treasury Bills	$ 329,706	$ 0
Dividends and dividend equivalents payable	46,357	47,751
Lease liability	44,825	44,977
Accrued interest payable	16,040	9,621
Accrued expenses and other	110,864	115,709
Total Other Liabilities	$ 547,792	$ 218,058
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Total Other Liabilities	Total Other Liabilities