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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) loan
Financing Receivable, Impaired [Line Items]
(Recovery of) provision for loan losses	$ (2,263,000)	$ 2,067,000	$ (6,057,000)	$ 6,070,000
Impaired Loans
Number of non accrual loans | loan	1		1		1
Interest income on Impaired loans			$ 0	$ 0
Commercial Portfolio Segment
Impaired Loans
Amortized Cost	$ 56,610,000		56,610,000		$ 53,305,000
Unpaid Principal Balance	55,859,000		55,859,000		52,552,000
Related Allowance	(590,000)		(590,000)		(743,000)
Commercial Portfolio Segment | Senior mortgages
Impaired Loans
Amortized Cost	56,610,000		56,610,000		53,305,000
Unpaid Principal Balance	55,859,000		55,859,000		52,552,000
Related Allowance	$ (590,000)		$ (590,000)		$ (743,000)

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Impaired Financing Receivable [Abstract]

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Number Of Non Accrual Loans

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Amount of allowance for credit losses related to recorded investment.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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-Publisher FASB
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