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Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	$ 159,569		$ 153,216
Total gross carrying value of loans receivable and other lending investments	798,520		856,495
Allowance for loan losses	(33,447)		(28,634)
Total loans receivable and other lending investments, net	765,073		827,861
Financing receivables (refer to Note 5)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	45,704		44,339
Held-to-maturity debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	89,234		84,981
Available-for-sale debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	24,631		23,896
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	638,951		703,280
Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	520,629		572,585
Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	106,877		119,818
Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	11,445		10,877
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	552,806		614,386
Allowance for loan losses	(9,138)	$ (11,736)	(6,668)
Construction loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	552,806		614,386
Construction loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	467,774		518,992
Construction loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	85,032		95,394
Completed construction | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 262,100
Percentage of construction loans	47.00%
Substantially completed construction | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 22,500
Percentage of construction loans	4.00%
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 86,145		88,893
Allowance for loan losses	(478)	$ (905)	(265)
Loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	52,855		53,592
Loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	21,845		24,424
Loans | Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 11,445		$ 10,877

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