Mortgage-Backed Securities - Schedule of Unrealized Losses and Estimated Fair Value of MBS and GSE CRT by Length of Time (Details) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Fair Value
Less than 12 Months	$ 27,421	$ 981,650
12 Months or More	23,126	4,345
Total	50,547	985,995
Unrealized Losses
Less than 12 Months	(1,222)	(9,180)
12 Months or More	(2,992)	(1,057)
Total	$ (4,214)	$ (10,237)
Number of Securities
Less than 12 Months (in securities) | security	4	17
12 Months or More (in securities) | security	15	10
Total (in securities) | security	19	27
30 year fixed-rate Agency RMBS
Fair Value
Less than 12 Months		$ 929,292
12 Months or More		0
Total		929,292
Unrealized Losses
Less than 12 Months		(7,060)
12 Months or More		0
Total		$ (7,060)
Number of Securities
Less than 12 Months (in securities) | security		7
12 Months or More (in securities) | security		0
Total (in securities) | security		7
Agency-CMO
Fair Value
Less than 12 Months	$ 17,486	$ 25,417
12 Months or More	21,664	2,934
Total	39,150	28,351
Unrealized Losses
Less than 12 Months	(849)	(1,645)
12 Months or More	(2,574)	(496)
Total	$ (3,423)	$ (2,141)
Number of Securities
Less than 12 Months (in securities) | security	3	6
12 Months or More (in securities) | security	6	1
Total (in securities) | security	9	7
Non-Agency CMBS
Fair Value
Less than 12 Months	$ 9,935	$ 26,592
12 Months or More	0	0
Total	9,935	26,592
Unrealized Losses
Less than 12 Months	(373)	(439)
12 Months or More	0	0
Total	$ (373)	$ (439)
Number of Securities
Less than 12 Months (in securities) | security	1	2
12 Months or More (in securities) | security	0	0
Total (in securities) | security	1	2
Non-Agency RMBS
Fair Value
Less than 12 Months	$ 0	$ 349
12 Months or More	1,462	1,411
Total	1,462	1,760
Unrealized Losses
Less than 12 Months	0	(36)
12 Months or More	(418)	(561)
Total	$ (418)	$ (597)
Number of Securities
Less than 12 Months (in securities) | security	0	2
12 Months or More (in securities) | security	9	9
Total (in securities) | security	9	11
Non-Agency IO
Fair Value
Total	$ 1,200	$ 1,400
Unrealized Losses
Total	$ (399)	$ (561)