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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jan. 01, 2020
Financing Receivables
Allowance for loan losses at beginning of period			$ 28,634
Adoption of new accounting	$ 35,612		35,612		$ 35,612
Provision for loan losses	2,067	$ 110	6,070	$ 13
Allowance for loan losses at end of period	35,612		35,612
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period	53		0
Adoption of new accounting standard	111		0		111
Provision for loan losses	58		91
Allowance for loan losses at end of period	111		111
Total
Allowance for loan losses at beginning of period	33,264		28,634
Adoption of new accounting standard	35,612		28,634		35,612
Provision for loan losses	2,348		6,249
Allowance for loan losses at end of period	35,612		35,612
Increase to reserves for loan losses					2,400
Provision for loan losses	2,300
Accounts Payable, Accrued Expenses, and Other Liabilities
Total
Increase to reserves for loan losses						$ 2,500
Expected recoveries for unfunded commitments	300		200
ASU 2016-13
Total
Increase to reserves for loan losses						3,300
Provision for loan losses			6,200
Period of Adoption, Adjustment
Held to Maturity Debt Securities
Adoption of new accounting standard						20
Total
Adoption of new accounting standard						729
Construction Loans
Financing Receivables
Allowance for loan losses at beginning of period	9,724		6,668
Adoption of new accounting	11,736		11,736		11,736
Provision for loan losses	2,012		5,421
Allowance for loan losses at end of period	11,736		11,736
Construction Loans | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting						(353)
Loans
Financing Receivables
Allowance for loan losses at beginning of period	686		265
Adoption of new accounting	905		265		905
Provision for loan losses	219		542
Allowance for loan losses at end of period	905		905
Loans | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting						98
Financing Receivables
Financing Receivables
Allowance for loan losses at beginning of period	1,100		0
Adoption of new accounting	1,159		0		1,159
Provision for loan losses	59		195
Allowance for loan losses at end of period	1,159		1,159
Financing Receivables | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting						964
Specific Allowance
Financing Receivables
Allowance for loan losses at beginning of period	21,701		21,701
Adoption of new accounting	21,701		21,701		$ 21,701
Provision for loan losses	0		0
Allowance for loan losses at end of period	$ 21,701		$ 21,701
Specific Allowance | Period of Adoption, Adjustment
Financing Receivables
Adoption of new accounting						$ 0

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