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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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