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Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details) - Commercial Portfolio Segment - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Recorded investment in loans, aged by payment status and presented by class |  |
Current | $ 497,515 | $ 665,460
Total Past Due | 85,447 | 37,820
Total | 582,962 | 703,280
Less Than and Equal to 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 85,447 | 0
Greater than 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 37,820
Senior mortgages |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Current | 443,154 | 534,765
Total Past Due | 42,501 | 37,820
Total | 485,655 | 572,585
Senior mortgages | Less Than and Equal to 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 42,501 | 0
Senior mortgages | Greater than 90 Days |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Total Past Due | 0 | 37,820
Corporate/Partnership loans |  |
Recorded investment in loans, aged by payment status and presented by class |  |
Current | 42,721 | 119,818
Total Past Due | 42,946 | 0
Total | 85,667 | 119,818
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 | 42,946 | 0
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 | 11,640 | 10,877
Total Past Due | 0 | 0
Total | 11,640 | 10,877
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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