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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) $ in Thousands	Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Number of non accrual loans | loan	1	1
Commercial Portfolio Segment
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	$ 379,126	$ 582,962
Commercial Portfolio Segment | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	327,011	485,655
Loan on non-accrual status	56,300
Commercial Portfolio Segment | Corporate/partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	40,276	85,667
Commercial Portfolio Segment | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	11,839	$ 11,640
Commercial Portfolio Segment | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	35,944
2020	0
2019	47,409
2018	196,271
2017	75,014
Prior to 2017	15,553
Total	370,191
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	33,419
2020	0
2019	0
2018	158,520
2017	75,014
Prior to 2017	3,714
Total	270,667
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	75,014
Prior to 2017	0
Total	75,014
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	33,419
2020	0
2019	0
2018	113,154
2017	0
Prior to 2017	3,714
Total	150,287
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	45,366
2017	0
Prior to 2017	0
Total	45,366
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Senior mortgages | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	2,525
2020	0
2019	0
2018	37,751
2017	0
Prior to 2017	0
Total	40,276
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	2,525
2020	0
2019	0
2018	18,098
2017	0
Prior to 2017	0
Total	20,623
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	19,653
2017	0
Prior to 2017	0
Total	19,653
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Corporate/partnership loans | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	11,839
Total	11,839
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	11,839
Total	11,839
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Subordinate mortgages | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	47,409
2018	0
2017	0
Prior to 2017	0
Total	47,409
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 1.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 1.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 2.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	47,409
2018	0
2017	0
Prior to 2017	0
Total	47,409
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 2.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 3.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 3.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 4.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 4.5
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	0
Commercial Portfolio Segment | Performing Financial Instruments | Financing Receivables | Risk Rating 5.0
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2021	0
2020	0
2019	0
2018	0
2017	0
Prior to 2017	0
Total	$ 0

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