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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) loan	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of non accrual loans | loan	1		1
Interest income on Impaired loans	$ 0	$ 0
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost	56,343,000		$ 53,305,000
Unpaid Principal Balance	55,592,000		52,552,000
Related Allowance	(667,000)		(743,000)
Commercial Portfolio Segment | Senior mortgages
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost	56,343,000		53,305,000
Unpaid Principal Balance	55,592,000		52,552,000
Related Allowance	$ (667,000)		$ (743,000)

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Number Of Non Accrual Loans

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-Topic 310
-SubTopic 10
-Section 50
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