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Loans Receivable and Other Lending Investments, net - Credit Characteristics for Performing Loans (Details) $ in Thousands	Sep. 30, 2020 USD ($) Loan	Dec. 31, 2019 USD ($) Loan
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Number of non accrual loans | Loan	2	1
Commercial Portfolio Segment
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	$ 638,951	$ 703,280
Commercial Portfolio Segment | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	60,504
2018	293,426
2017	144,011
2016	83,862
Prior to 2016	15,575
Total	597,378
Commercial Portfolio Segment | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	520,629	572,585
Loan on non-accrual status	87,300
Commercial Portfolio Segment | Senior mortgages | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	13,296
2018	229,984
2017	144,011
2016	41,931
Prior to 2016	4,130
Total	433,352
Commercial Portfolio Segment | Senior mortgages | Risk Rating 1.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Senior mortgages | Risk Rating 1.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Senior mortgages | Risk Rating 2.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Senior mortgages | Risk Rating 2.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	123,519
2017	0
2016	0
Prior to 2016	0
Total	123,519
Commercial Portfolio Segment | Senior mortgages | Risk Rating 3.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	13,296
2018	106,465
2017	144,011
2016	41,931
Prior to 2016	4,130
Total	309,833
Commercial Portfolio Segment | Senior mortgages | Risk Rating 3.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Senior mortgages | Risk Rating 4.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Senior mortgages | Risk Rating 4.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Senior mortgages | Risk Rating 5.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	106,877	119,818
Commercial Portfolio Segment | Corporate/Partnership loans | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	1,504
2018	63,442
2017	0
2016	41,931
Prior to 2016	0
Total	106,877
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 1.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	16,404
2017	0
2016	0
Prior to 2016	0
Total	16,404
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 1.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 2.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 2.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 3.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	1,504
2018	25,194
2017	0
2016	0
Prior to 2016	0
Total	26,698
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 3.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 4.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	21,844
2017	0
2016	41,931
Prior to 2016	0
Total	63,775
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 4.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Corporate/Partnership loans | Risk Rating 5.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Total	11,445	$ 10,877
Commercial Portfolio Segment | Subordinate mortgages | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	11,445
Total	11,445
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 1.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 1.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 2.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 2.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 3.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	11,445
Total	11,445
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 3.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 4.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 4.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Subordinate mortgages | Risk Rating 5.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	45,704
2018	0
2017	0
2016	0
Prior to 2016	0
Total	45,704
Commercial Portfolio Segment | Financing Receivables | Risk Rating 1.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 1.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 2.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	45,704
2018	0
2017	0
2016	0
Prior to 2016	0
Total	45,704
Commercial Portfolio Segment | Financing Receivables | Risk Rating 2.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 3.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 3.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 4.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 4.5 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	0
Commercial Portfolio Segment | Financing Receivables | Risk Rating 5.0 | Performing Financial Instruments
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
2020	0
2019	0
2018	0
2017	0
2016	0
Prior to 2016	0
Total	$ 0

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