Investment in Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 38,100		$ 38,100		$ 29,700
Available-for-sale securities Realizes Losses - Write offs	(1,800)	$ (5,000)	(8,100)	$ (15,800)
Catch-up premium amortization adjustment	23	500	900	(100)
Proprietary reverse mortgage loans
Securities, Available-for-sale [Line Items]
Transfer to held-for-investment from held-for-sale - Loan UPB	$ 379,300	$ 97,800	$ 580,000	$ 396,000