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Loans Receivable and Other Lending Investments, net (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jan. 01, 2020
Financing Receivables
Allowance for loan losses at beginning of period			$ 13,170
(Recovery of) provision for loan losses	$ (2,263)	$ 2,067	(6,057)	$ 6,070
Allowance for loan losses at end of period	7,135		7,135
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period	2,685	53	3,093
(Recovery of) Provision for loan losses	(292)	58	(700)	91
Allowance for loan losses at end of period	2,393	111	2,393	111
Total
Allowance for loan losses at beginning of period	9,058	33,264	13,170	28,634
(Recovery of) Provision for loan losses	(1,923)	2,348	(6,035)	6,249
Allowance for loan losses at end of period	7,135	35,612	7,135	35,612
Increase to reserves for loan losses	1,000		1,000		$ 1,000
Provision for (recovery of) loan losses	(2,300)	2,100	(6,100)	6,100
Accounts Payable, Accrued Expenses and Other Liabilities
Total
Increase to reserves for loan losses						$ 2,500
Recoveries for unfunded commitments	400	300		200
ASU 2016-13
Total
Increase to reserves for loan losses						$ 3,300
Period of Adoption, Adjustment
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period				20
Total
Allowance for loan losses at beginning of period				729
Construction Loans
Financing Receivables
Allowance for loan losses at beginning of period	2,893	9,724	6,541	6,668
(Recovery of) provision for loan losses	(1,253)	2,012	(4,901)	5,421
Allowance for loan losses at end of period	1,640	11,736	1,640	11,736
Construction Loans | Period of Adoption, Adjustment
Financing Receivables
Allowance for loan losses at beginning of period				(353)
Loans
Financing Receivables
Allowance for loan losses at beginning of period	1,815	686	1,643	265
(Recovery of) provision for loan losses	(196)	219	(24)	542
Allowance for loan losses at end of period	1,619	905	1,619	905
Loans | Period of Adoption, Adjustment
Financing Receivables
Allowance for loan losses at beginning of period				98
Financing receivables (refer to Note 5)
Financing Receivables
Allowance for loan losses at beginning of period	998	1,100	1,150
(Recovery of) provision for loan losses	(105)	59	(257)	195
Allowance for loan losses at end of period	893	1,159	893	1,159
Financing receivables (refer to Note 5) | Period of Adoption, Adjustment
Financing Receivables
Allowance for loan losses at beginning of period				964
Specific receivables
Financing Receivables
Allowance for loan losses at beginning of period	667	21,701	743	21,701
(Recovery of) provision for loan losses	(77)		(153)
Allowance for loan losses at end of period	$ 590	$ 21,701	$ 590	$ 21,701

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