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Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | $ 159,569 |  | $ 153,216
Total gross carrying value of loans receivable and other lending investments | 798,520 |  | 856,495
Allowance for loan losses | (33,447) |  | (28,634)
Total loans receivable and other lending investments, net | 765,073 |  | 827,861
Financing receivables (refer to Note 5) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | 45,704 |  | 44,339
Held-to-maturity debt securities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | 89,234 |  | 84,981
Available-for-sale debt securities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | 24,631 |  | 23,896
Commercial Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 638,951 |  | 703,280
Commercial Portfolio Segment | Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 520,629 |  | 572,585
Commercial Portfolio Segment | Corporate/Partnership loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 106,877 |  | 119,818
Commercial Portfolio Segment | Subordinate mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 11,445 |  | 10,877
Construction loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 552,806 |  | 614,386
Allowance for loan losses | (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 | 552,806 |  | 614,386
Construction loans | Commercial Portfolio Segment | Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 467,774 |  | 518,992
Construction loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 85,032 |  | 95,394
Completed construction | Commercial Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 262,100 |  |
Percentage of construction loans | 47.00% |  |
Substantially completed construction | Commercial Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 22,500 |  |
Percentage of construction loans | 4.00% |  |
Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 86,145 |  | 88,893
Allowance for loan losses | (478) | $ (905) | (265)
Loans | Commercial Portfolio Segment | Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 52,855 |  | 53,592
Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 21,845 |  | 24,424
Loans | Commercial Portfolio Segment | Subordinate mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 11,445 |  | $ 10,877

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