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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 111,628	$ 1,383,390
Realized Gains	5,208	11,058
Realized Losses	(833)	(69,795)
Net Realized Gains (Losses)	4,375	(58,737)
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		992,993
Realized Gains		5,392
Realized Losses		(15,870)
Net Realized Gains (Losses)		(10,478)
Agency RMBS | Agency ARMs
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		49,893
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		943,100
Realized Gains		5,348
Realized Losses		(11,713)
Net Realized Gains (Losses)		(6,365)
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		1,138,404
Realized Gains		11,058
Realized Losses		(16,079)
Net Realized Gains (Losses)		(5,021)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	72,083	130,948
Realized Gains	12	0
Realized Losses	(833)	(24,132)
Net Realized Gains (Losses)	(821)	(24,132)
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	39,545	114,038
Realized Gains	5,196	0
Realized Losses	0	(29,584)
Net Realized Gains (Losses)	$ 5,196	$ (29,584)

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- Definition

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

+ References

No definition available.

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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=121645371&loc=d3e27357-111563

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- Definition

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=121645371&loc=d3e27357-111563

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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