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Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	$ 157,399		$ 153,216
Total gross carrying value of loans receivable and other lending investments	837,319		856,495
Allowance for loan losses	(35,612)		(28,634)
Total loans receivable and other lending investments, net	801,707		827,861
Financing receivables (refer to Note 5)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	45,033		44,339
Held-to-maturity debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	87,755		84,981
Available-for-sale debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other lending investments	24,611		23,896
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	679,920		703,280
Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	549,607		572,585
Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	119,061		119,818
Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	11,252		10,877
Construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	592,929		614,386
Allowance for loan losses	(11,736)	$ (9,724)	(6,668)
Construction loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	592,929		614,386
Construction loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	496,465		518,992
Construction loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	96,464		95,394
Completed construction | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 119,300
Percentage of construction loans	20.00%
Substantially completed construction | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 209,000
Percentage of construction loans	35.00%
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 86,991		88,893
Allowance for loan losses	(905)	$ (686)	(265)
Loans | Commercial Portfolio Segment | Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	53,142		53,592
Loans | Commercial Portfolio Segment | Corporate/Partnership loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	22,597		24,424
Loans | Commercial Portfolio Segment | Subordinate mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal - gross carrying value of loans	$ 11,252		$ 10,877

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