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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Other lending investments |  | $ 171,296 |  | $ 162,538 |  |  |
Total gross carrying value of loans receivable and other lending investments |  | 411,879 |  | 745,500 |  |  |
Allowance for loan losses |  | (6,370) |  | (13,170) |  |  |
Total loans receivable and other lending investments, net | [1] | 405,509 |  | 732,330 |  |  |
Financing receivables |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Other lending investments |  | 48,503 |  | 46,549 |  |  |
Held-to-maturity debt securities |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Other lending investments |  | 95,258 |  | 90,715 |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Other lending investments |  | 27,535 |  | 25,274 |  |  |
Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 240,583 |  | 582,962 |  |  |
Commercial Portfolio Segment | Senior mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 206,878 |  | 485,655 |  |  |
Commercial Portfolio Segment | Corporate/Partnership loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 21,457 |  | 85,667 |  |  |
Commercial Portfolio Segment | Subordinate mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 12,248 |  | 11,640 |  |  |
Construction Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 195,213 |  | 514,833 |  |  |
Allowance for loan losses |  | (1,491) | $ (1,640) | (6,541) | $ (9,138) | $ (11,736) | $ (6,668)
Construction Loans | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 195,213 |  | 514,833 |  |  |
Construction Loans | Commercial Portfolio Segment | Senior mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 191,697 |  | 449,733 |  |  |
Construction Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | $ 3,516 |  | 65,100 |  |  |
Completed construction | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of construction loans |  | 98.00% |  |  |  |  |
Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | $ 45,370 |  | 68,129 |  |  |
Allowance for loan losses |  | (754) | $ (1,619) | (1,643) | $ (478) | $ (905) | $ (265)
Loans | Commercial Portfolio Segment | Senior mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 15,181 |  | 35,922 |  |  |
Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | 17,941 |  | 20,567 |  |  |
Loans | Commercial Portfolio Segment | Subordinate mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Subtotal - gross carrying value of loans |  | $ 12,248 |  | $ 11,640 |  |  |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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