Mortgage-Backed Securities and Other Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-sale, Gain (Loss) [Abstract]
Net Gain  (Loss)	$ (82,818)	$ 12,145
Non-Agency CMBS
Debt Securities, Available-for-sale, Gain (Loss) [Abstract]
Proceeds	0	0
Gross Gains	0	0
Gross Losses	(2)	0
Net Gain  (Loss)	(2)	0
Other securities
Debt Securities, Available-for-sale, Gain (Loss) [Abstract]
Proceeds	6,630	0
Gross Gains	0	0
Gross Losses	(1,565)	0
Net Gain  (Loss)	(1,565)	0
Total
Debt Securities, Available-for-sale, Gain (Loss) [Abstract]
Proceeds	6,630	0
Gross Gains	0	0
Gross Losses	(1,567)	0
Net Gain  (Loss)	$ (1,567)	$ 0