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Loans Receivable and Other Lending Investments, net (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 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	$ (1,556)	$ (1,976)	(7,613)	$ 4,093
Allowance for loan losses at end of period	6,370		6,370
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period	2,393	111	3,093
(Recovery of) Provision for loan losses	145	(56)	(555)	35
Allowance for loan losses at end of period	2,538	55	2,538	55
Total
Allowance for loan losses at beginning of period	7,135	35,612	13,170	28,634
(Recovery of) Provision for loan losses	(765)	(2,165)	(6,800)	4,084
Allowance for loan losses at end of period	6,370	33,447	6,370	33,447
Increase to reserves for loan losses	100		100		$ 1,000
Provision for (recovery of) loan losses	(1,600)	(2,000)	(7,600)	4,100
Accrued Interest And Operating Lease Income Receivable, Net
Total
Provision for (recovery of) loan losses		900		900
Accounts Payable, Accrued Expenses and Other Liabilities
Total
Provision for ( recovery of) unfunded commitments	(900)	(700)	(900)	(900)
Period of Adoption, Adjustment | ASU 2016-13
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period				20
Total
Allowance for loan losses at beginning of period				729
Increase to reserves for loan losses						$ 3,300
Period of Adoption, Adjustment | ASU 2016-13 | Accounts Payable, Accrued Expenses and Other Liabilities
Total
Increase to reserves for loan losses						$ 2,500
Construction Loans
Financing Receivables
Allowance for loan losses at beginning of period	1,640	11,736	6,541	6,668
(Recovery of) provision for loan losses	(149)	(2,598)	(5,050)	2,823
Allowance for loan losses at end of period	1,491	9,138	1,491	9,138
Construction Loans | Period of Adoption, Adjustment | ASU 2016-13
Financing Receivables
Allowance for loan losses at beginning of period				(353)
Loans
Financing Receivables
Allowance for loan losses at beginning of period	1,619	905	1,643	265
(Recovery of) provision for loan losses	(865)	(427)	(889)	115
Allowance for loan losses at end of period	754	478	754	478
Loans | Period of Adoption, Adjustment | ASU 2016-13
Financing Receivables
Allowance for loan losses at beginning of period				98
Financing receivables
Financing Receivables
Allowance for loan losses at beginning of period	893	1,159	1,150
(Recovery of) provision for loan losses	54	17	(203)	212
Allowance for loan losses at end of period	947	1,176	947	1,176
Financing receivables | Period of Adoption, Adjustment | ASU 2016-13
Financing Receivables
Allowance for loan losses at beginning of period				964
Specific receivables
Financing Receivables
Allowance for loan losses at beginning of period	590	21,701	743	21,701
(Recovery of) provision for loan losses	50	899	(103)	899
Allowance for loan losses at end of period	$ 640	$ 22,600	$ 640	$ 22,600

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