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Loans Receivable and Other Lending Investments, net - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020
Financing Receivables
Allowance for loan losses at beginning of period	$ 28,634
Adoption of new accounting standard			$ (12,382)
Provision for loan losses	4,003	$ (97)
Allowance for loan losses at end of period	33,264
Held to Maturity Debt Securities
Allowance for loan losses at beginning of period	0
Adoption of new accounting standard			(12,382)
Provision for loan losses	33
Allowance for loan losses at end of period	53
Total
Allowance for loan losses at beginning of period	28,634
Adoption of new accounting standard			(12,382)
Provision for loan losses	3,901
Allowance for loan losses at end of period	33,264
Increase to reserves for loan losses	2,600
Provision for loan losses	4,000
Expected credit losses for unfunded commitments	100
ASU 2016-13
Financing Receivables
Adoption of new accounting standard			729
Held to Maturity Debt Securities
Adoption of new accounting standard			729
Total
Adoption of new accounting standard			729
Increase to reserves for loan losses			3,300
ASU 2016-13 | Accounts Payable, Accrued Expenses, and Other Liabilities
Total
Increase to reserves for loan losses			2,500
Held to Maturity Debt Securities
Financing Receivables
Adoption of new accounting standard			20
Held to Maturity Debt Securities
Adoption of new accounting standard			20
Total
Adoption of new accounting standard			20
Construction Loans
Financing Receivables
Allowance for loan losses at beginning of period	6,668
Provision for loan losses	3,409
Allowance for loan losses at end of period	9,724
Construction Loans | Financing Receivables
Financing Receivables
Adoption of new accounting standard			(353)
Held to Maturity Debt Securities
Adoption of new accounting standard			(353)
Total
Adoption of new accounting standard			(353)
Loans
Financing Receivables
Allowance for loan losses at beginning of period	265
Provision for loan losses	323
Allowance for loan losses at end of period	686
Loans | Financing Receivables
Financing Receivables
Adoption of new accounting standard			98
Held to Maturity Debt Securities
Adoption of new accounting standard			98
Total
Adoption of new accounting standard			98
Financing receivables
Financing Receivables
Allowance for loan losses at beginning of period	0
Provision for loan losses	136
Allowance for loan losses at end of period	1,100
Financing receivables | Financing Receivables
Financing Receivables
Adoption of new accounting standard			964
Held to Maturity Debt Securities
Adoption of new accounting standard			964
Total
Adoption of new accounting standard			964
Specific Allowance
Financing Receivables
Allowance for loan losses at beginning of period	21,701
Provision for loan losses	0
Allowance for loan losses at end of period	$ 21,701
Specific Allowance | Financing Receivables
Financing Receivables
Adoption of new accounting standard			0
Held to Maturity Debt Securities
Adoption of new accounting standard			0
Total
Adoption of new accounting standard			$ 0

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