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Loans and Investments - Non-performing Loans (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Non-performing loans by asset class
Number of loans | loan	405	328
Amortized cost of loans on nonaccrual status		$ 0
UPB	$ 172,721	$ 282,785
Non-performing loans
Non-performing loans by asset class
Number of loans	8	7
Carrying value of loans	$ 77,500	$ 53,800
Loan loss reserves	6,500	6,500
UPB	86,375	62,325
Greater than 90 Days Past Due
Non-performing loans by asset class
Past Due	0
Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	86,375	62,325
Student Housing | Non-performing loans
Non-performing loans by asset class
UPB	60,550	36,500
Student Housing | Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	60,550	36,500
Multifamily | Non-performing loans
Non-performing loans by asset class
UPB	17,700	17,700
Multifamily | Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	17,700	17,700
Healthcare
Non-performing loans by asset class
UPB	4,625	4,625
Healthcare | Non-performing loans
Non-performing loans by asset class
UPB	4,625	4,625
Healthcare | Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	4,625	4,625
Retail
Non-performing loans by asset class
UPB	30,045	30,079
Retail | Non-performing loans
Non-performing loans by asset class
UPB	920	920
Retail | Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	920	920
Commercial
Non-performing loans by asset class
UPB	1,700	1,700
Commercial | Non-performing loans
Non-performing loans by asset class
UPB	1,700	1,700
Commercial | Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	1,700	1,700
Office
Non-performing loans by asset class
UPB	2,136	2,166
Office | Non-performing loans
Non-performing loans by asset class
UPB	880	880
Office | Greater than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due	$ 880	$ 880

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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