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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 133,060	$ 370,173	$ 248,458	$ 1,815,369
Realized Gains	10,337	6,990	15,936	19,679
Realized Losses	(452)	(9,565)	(1,285)	(81,033)
Net Realized Gains (Losses)	(9,885)	2,575	(14,651)	61,354
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	43,579	259,493	115,662	428,251
Realized Gains	4,841	141	4,853	435
Realized Losses	0	(8,860)	(833)	(34,681)
Net Realized Gains (Losses)	(4,841)	8,719	(4,020)	34,246
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust
Debt Securities, Available-for-sale [Line Items]
Net Realized Gains (Losses)	(4,800)		(4,800)
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	89,481	110,680	132,796	248,741
Realized Gains	5,496	6,849	11,083	8,176
Realized Losses	(452)	(705)	(452)	(30,289)
Net Realized Gains (Losses)	$ (5,044)	$ (6,144)	$ (10,631)	$ 22,113

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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)
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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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