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Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) - Commercial Portfolio Segment - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Recorded investment in loans, aged by payment status and presented by class |  |
Current | $ 181,764 | $ 497,515
Total Past Due | 58,819 | 85,447
Total | 240,583 | 582,962
Less Than and Equal to 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 85,447
Greater Than 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 58,819 | 0
Senior mortgages |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Current | 148,059 | 443,154
Total Past Due | 58,819 | 42,501
Total | 206,878 | 485,655
Senior mortgages | Less Than and Equal to 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 42,501
Senior mortgages | Greater Than 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 58,819 | 0
Corporate/Partnership loans |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Current | 21,457 | 42,721
Total Past Due | 0 | 42,946
Total | 21,457 | 85,667
Corporate/Partnership loans | Less Than and Equal to 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 42,946
Corporate/Partnership loans | Greater Than 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 0
Subordinate mortgages |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Current | 12,248 | 11,640
Total Past Due | 0 | 0
Total | 12,248 | 11,640
Subordinate mortgages | Less Than and Equal to 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 0
Subordinate mortgages | Greater Than 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | $ 0 | $ 0

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