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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 370,173,000	$ 41,182,000	$ 1,815,369,000	$ 97,951,000
Realized Gains	6,990,000	5,013,000	19,679,000	21,971,000
Realized Losses	(9,565,000)	0	(81,033,000)	(156,000)
Net Realized Gains (Losses)	(2,575,000)	5,013,000	(61,354,000)	21,815,000
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			992,966,000
Realized Gains			5,402,000
Realized Losses			(15,854,000)
Net Realized Gains (Losses)			(10,452,000)
Agency RMBS | Agency ARMs
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			49,892,000
Realized Gains			44,000
Realized Losses			(4,157,000)
Net Realized Gains (Losses)			(4,113,000)
Agency RMBS | Agency Fixed- Rate
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			943,074,000
Realized Gains			5,358,000
Realized Losses			(11,697,000)
Net Realized Gains (Losses)			(6,339,000)
Agency CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			145,411,000
Realized Gains			5,666,000
Realized Losses			(209,000)
Net Realized Gains (Losses)			5,457,000
Total Agency
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			1,138,377,000
Realized Gains			11,068,000
Realized Losses			(16,063,000)
Net Realized Gains (Losses)			(4,995,000)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	259,493,000	1,021,000	428,251,000	1,021,000
Realized Gains	141,000	33,000	435,000	33,000
Realized Losses	(8,860,000)	0	(34,681,000)	0
Net Realized Gains (Losses)	(8,719,000)		(34,246,000)
Non-Agency RMBS | Non-Agency RMBS Held in Securitization Trust
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	40,400,000		67,600,000
Net Realized Gains (Losses)	26,100		200,000
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	110,680,000	40,161,000	248,741,000	96,930,000
Realized Gains	6,849,000	4,980,000	8,176,000	21,938,000
Realized Losses	(705,000)	0	(30,289,000)	(156,000)
Net Realized Gains (Losses)	$ 6,144,000	$ 4,980,000	$ (22,113,000)	$ 21,782,000

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- Definition

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

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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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+ 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)
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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 320
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-Section 50
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