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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 0	$ 3,770,000	$ 24,374,000	$ 115,398,000
Realized Gains		392,000	374,000	5,599,000
Realized Losses		0	0	(833,000)
Net Realized Gains (Losses)		392,000	374,000	4,766,000
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		3,770,000		43,315,000
Realized Gains		392,000		5,587,000
Realized Losses		0		0
Net Realized Gains (Losses)		$ 392,000		5,587,000
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			24,374,000	72,083,000
Realized Gains			374,000	12,000
Realized Losses			0	(833,000)
Net Realized Gains (Losses)			$ 374,000	$ (821,000)

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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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