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Loans Receivable and Other Lending Investments, net (Investment in Loans and Associated Allowance for Loan Losses) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Other Lending Investments
Total		$ 163,648	$ 162,538
Less: Allowance for loan losses
Individually Evaluated for Impairment		(667)	(743)
Collectively Evaluated for Impairment		(8,391)	(12,427)
Total		(9,058)	(13,170)
Individually Evaluated for Impairment		55,676	52,562
Collectively Evaluated for Impairment		478,040	679,768
Total loans receivable and other lending investments, net	[1]	533,716	732,330
Net discounts		800	800
Held-to-maturity debt securities
Other Lending Investments
Individually Evaluated for Impairment		0	0
Collectively Evaluated for Impairment		92,196	90,715
Total		92,196	90,715
Available-for-sale debt securities
Other Lending Investments
Individually Evaluated for Impairment		0	0
Collectively Evaluated for Impairment		24,043	25,274
Total		24,043	25,274
Construction loans
Loans
Individually Evaluated for Impairment		56,343	53,305
Collectively Evaluated for Impairment		241,533	461,528
Total		297,876	514,833
Less: Allowance for loan losses
Total		(2,893)	(6,541)	$ (9,724)	$ (6,668)
Loans
Loans
Individually Evaluated for Impairment		0	0
Collectively Evaluated for Impairment		81,250	68,129
Total		81,250	68,129
Less: Allowance for loan losses
Total		(1,815)	(1,643)	(686)	(265)
Net discounts		2,200	2,300
Financing receivables
Loans
Individually Evaluated for Impairment		0	0
Collectively Evaluated for Impairment		47,409	46,549
Total		47,409	46,549
Less: Allowance for loan losses
Total		$ (998)	$ (1,150)	$ (1,100)	$ 0
[1] (1)Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

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