Mortgage-Backed Securities - Gains and Losses from Sales of Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Net realized gain (loss)	$ 0	$ (460)	$ (3,750)	$ (27,482)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales:	0	0	0	0
Gross realized gains:	0	0	0	0
Gross realized losses:	0	0	0	0
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales:	0	0	0	0
Gross realized gains:	0	0	0	0
Gross realized losses:	0		0
Agency CMBS
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales:	0	4,861	34,672	285,709
Gross realized gains:	0	0	0	0
Gross realized losses:	$ 0	$ (460)	$ (3,750)	$ (27,482)