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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 36,215	$ 133,060	$ 60,589	$ 248,458
Realized Gains	18,001	10,337	18,375	15,936
Realized Losses	0	(452)	0	(1,285)
Net Realized Gains (Losses)	18,001	9,885	18,375	14,651
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		43,579	24,374	115,662
Realized Gains		4,841	374	4,853
Realized Losses		0	0	(833)
Net Realized Gains (Losses)		4,841	374	4,020
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		89,481		132,796
Realized Gains		5,496		11,083
Realized Losses		(452)		(452)
Net Realized Gains (Losses)		$ 5,044		$ 10,631
ABS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	36,215		36,215
Realized Gains	18,001		18,001
Realized Losses	0		0
Net Realized Gains (Losses)	$ 18,001		$ 18,001

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563

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