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Loans Receivable and Other Lending Investments, net (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Financing Receivables
Allowance for loan losses at beginning of period	$ 13,170
Adoption of new accounting standard	9,058		$ 9,058	$ 13,170
(Recovery of) provision for loan losses	(3,794)	$ 4,003
Allowance for loan losses at end of period	9,058
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period	3,093	0
Adoption of new accounting standard	2,685	53	2,685	3,093
(Recovery of) Provision for loan losses	(408)	33
Allowance for loan losses at end of period	2,685	53
Total
Allowance for loan losses at beginning of period	13,170	28,634
Allowance For Credit Loss	9,058	33,264	9,058	13,170
(Recovery of) Provision for loan losses	(4,112)	3,901
Allowance for loan losses at end of period	9,058	33,264
Increase to reserves for loan losses			1,300	1,000
Recovery for loan losses	3,800	4,000
ASU 2016-13
Total
Increase to reserves for loan losses					$ 3,300
Period of Adoption, Adjustment
Held to Maturity Debt Securities
Adoption of new accounting standard					20
Total
Allowance For Credit Loss					729
Accounts Payable, Accrued Expenses, and Other Liabilities
Total
Increase to reserves for loan losses					2,500
Recoveries for unfunded commitments	300	100
Construction Loans
Financing Receivables
Allowance for loan losses at beginning of period	6,541	6,668
Adoption of new accounting standard	2,893	9,724	2,893	6,541
(Recovery of) provision for loan losses	(3,648)	3,409
Allowance for loan losses at end of period	2,893	9,724
Construction Loans | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting standard					(353)
Loans
Financing Receivables
Allowance for loan losses at beginning of period	1,643	265
Adoption of new accounting standard	1,815	686	1,815	1,643
(Recovery of) provision for loan losses	172	323
Allowance for loan losses at end of period	1,815	686
Loans | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting standard					98
Financing Receivables
Financing Receivables
Allowance for loan losses at beginning of period	1,150	0
Adoption of new accounting standard	998	1,100	998	1,150
(Recovery of) provision for loan losses	(152)	136
Allowance for loan losses at end of period	998	1,100
Financing Receivables | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting standard					964
Specific Allowance
Financing Receivables
Allowance for loan losses at beginning of period	743	21,701
Adoption of new accounting standard	667	21,701	$ 667	$ 743
(Recovery of) provision for loan losses	(76)	0
Allowance for loan losses at end of period	$ 667	$ 21,701
Specific Allowance | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting standard					$ 0

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