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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		$ 61,832	$ 115,398	$ 1,445,196
Realized Gains		1,621	5,599	12,689
Realized Losses		(1,690)	(833)	(71,468)
Net Realized Gains (Losses)		(69)	4,766	(58,779)
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds				992,966
Realized Gains				5,402
Realized Losses				(15,854)
Net Realized Gains (Losses)				(10,452)
Agency RMBS | Agency ARMs
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds				49,892
Realized Gains				44
Realized Losses				(4,157)
Net Realized Gains (Losses)				(4,113)
Agency RMBS | Agency Fixed- Rate
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds				943,074
Realized Gains				5,358
Realized Losses				(11,697)
Net Realized Gains (Losses)				(6,339)
Agency CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds				145,411
Realized Gains				5,666
Realized Losses				(209)
Net Realized Gains (Losses)				5,457
Total Agency
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds				1,138,377
Realized Gains				11,068
Realized Losses				(16,063)
Net Realized Gains (Losses)				(4,995)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		37,810	72,083	168,758
Realized Gains		294	12	294
Realized Losses		(1,690)	(833)	(25,821)
Net Realized Gains (Losses)		(1,396)	(821)	(25,527)
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 3,770	24,022	43,315	138,061
Realized Gains	392	1,327	5,587	1,327
Realized Losses	0	0	0	(29,584)
Net Realized Gains (Losses)	$ 392	$ 1,327	$ 5,587	$ (28,257)

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- Definition

Proceeds Including Receivable For Unsettled Trades From Sale of Debt Securities, Available-for-sale

+ References

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- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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