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Investment Securities Available For Sale, at Fair Value - Realized Gain or Loss Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 1,820,194	$ 97,951	$ 26,899
Realized Gains	19,679	21,971	88
Realized Losses	(81,208)	(156)	(12,358)
Net Realized Gains (Losses)	(61,529)	21,815	(12,270)
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	433,076	1,021
Realized Gains	435	33
Realized Losses	(34,856)	0
Net Realized Gains (Losses)	(34,421)	33
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	67,600
Net Realized Gains (Losses)	200
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	248,741	96,930
Realized Gains	8,176	21,938
Realized Losses	(30,289)	(156)
Net Realized Gains (Losses)	$ (22,113)	$ 21,782
Agency IOs
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			26,899
Realized Gains			88
Realized Losses			(12,358)
Net Realized Gains (Losses)			$ (12,270)

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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=121645371&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=121645371&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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