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Loans Receivable and Other Lending Investments, net - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | $ 729,646 | $ 703,280
Other lending investments | 154,453 | 153,216
Total gross carrying value of loans receivable and other lending investments | 884,099 | 856,495
Allowance for loan losses | (33,264) | (28,634)
Total loans receivable and other lending investments, net | 850,835 | 827,861
Financing receivables (refer to Note 5) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | 44,445 | 44,339
Held-to-maturity debt securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | 86,368 | 84,981
Available-for-sale debt securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | 23,640 | 23,896
Commercial Portfolio Segment | Senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 595,560 | 572,585
Commercial Portfolio Segment | Corporate/Partnership loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 123,023 | 119,818
Commercial Portfolio Segment | Subordinate mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 11,063 | 10,877
Construction loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 641,943 | 614,386
Allowance for loan losses | (9,724) | (6,668)
Construction loans | Commercial Portfolio Segment | Senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 542,241 | 518,992
Construction loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 99,702 | 95,394
Construction loans | Commercial Portfolio Segment | Subordinate mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 641,943 | 614,386
Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 87,703 | 88,893
Allowance for loan losses | (686) | (265)
Loans | Commercial Portfolio Segment | Senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 53,319 | 53,592
Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 23,321 | 24,424
Loans | Commercial Portfolio Segment | Subordinate mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | $ 11,063 | $ 10,877

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