Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Securities, Available-for-sale [Line Items]
Available-for-sale securities Realizes Losses - adjustments to cost basis of certain securities	$ (1,800)	$ (5,000)	$ (8,100)	$ (15,800)
Agency RMBS
Securities, Available-for-sale [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	41,771	72,827	83,623	491,031
Debt Securities, Available-for-Sale, Realized Gain	601	691	1,050	1,835
Debt Securities, Available-for-Sale, Realized Loss	(705)	(2,863)	(2,767)	(30,322)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	(104)	(2,172)	(1,717)	(28,487)
Non-Agency RMBS and CMBS
Securities, Available-for-sale [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	38,192	17,345	83,281	235,160
Debt Securities, Available-for-Sale, Realized Gain	2,048	1,513	9,312	10,055
Debt Securities, Available-for-Sale, Realized Loss	(228)	(849)	(217)	(8,371)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	1,820	664	9,095	1,684
CLOs
Securities, Available-for-sale [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	24,887	8,459	54,842	53,613
Debt Securities, Available-for-Sale, Realized Gain	504	863	1,261	1,341
Debt Securities, Available-for-Sale, Realized Loss	0	(498)	(1,118)	(613)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	504	365	143	728
Other Securities
Securities, Available-for-sale [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	199,404	74,965	650,911	223,885
Debt Securities, Available-for-Sale, Realized Gain	5,563	3,710	11,842	5,053
Debt Securities, Available-for-Sale, Realized Loss	(201)	(3,167)	(8,700)	(4,677)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	5,362	543	3,142	376
Securities Investment [Member]
Securities, Available-for-sale [Line Items]
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	304,254	173,596	872,657	1,003,689
Debt Securities, Available-for-Sale, Realized Gain	8,716	6,777	23,465	18,284
Debt Securities, Available-for-Sale, Realized Loss	(1,134)	(7,377)	(12,802)	(43,983)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	$ 7,582	$ (600)	$ 10,663	$ (25,699)