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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	$ 124,930	$ 115,989
Total gross carrying value of loans receivable and other lending investments	337,613	698,951
Allowance for loan losses	(4,769)	(12,020)
Total loans receivable and other lending investments, net	332,844	686,931
Held-to-maturity debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	96,838	90,715
Available-for-sale debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	28,092	25,274
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	212,683	582,962
Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	199,608	485,655
Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	618	85,667
Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	12,457	11,640
Construction Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	185,261	514,833
Allowance for loan losses	(1,213)	(6,541)	$ (6,668)
Construction Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	185,261	514,833
Construction Loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	184,643	449,733
Construction Loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 618	65,100
Completed construction | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of construction loans	100.00%
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 27,422	68,129
Allowance for loan losses	(676)	(1,643)	$ (265)
Loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	14,965	35,922
Loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans		20,567
Loans | Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 12,457	$ 11,640

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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