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Loans Receivable and Other Lending Investments, net - Impaired Loans (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) Loan | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Loan | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) Loan
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number of non accrual loans | Loan | 2 |  | 2 |  | 1
Interest income on Impaired loans | $ 0 | $ 0 | $ 0 | $ 0 |
Commercial Portfolio Segment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Amortized cost with related allowance recorded | 87,277,000 |  | 87,277,000 |  | $ 37,820,000
Unpaid principal balance with related allowance recorded | 86,627,000 |  | 86,627,000 |  | 37,923,000
Related Allowance with an allowance recorded | (22,600,000) |  | (22,600,000) |  | (21,701,000)
Commercial Portfolio Segment | Senior mortgages |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Amortized cost with related allowance recorded | 87,277,000 |  | 87,277,000 |  | 37,820,000
Unpaid principal balance with related allowance recorded | 86,627,000 |  | 86,627,000 |  | 37,923,000
Related Allowance with an allowance recorded | $ (22,600,000) |  | $ (22,600,000) |  | $ (21,701,000)

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