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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | $ 162,538 | $ 153,216
Total gross carrying value of loans receivable and other lending investments | 745,500 | 856,495
Allowance for loan losses | (13,170) | (28,634)
Total loans receivable and other lending investments, net | 732,330 | 827,861
Financing receivables (refer to Note 5) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | 46,549 | 44,339
Held-to-maturity debt securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | 90,715 | 84,981
Available-for-sale debt securities |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other lending investments | 25,274 | 23,896
Commercial Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 582,962 | 703,280
Construction loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 514,833 | 614,386
Allowance for loan losses | (6,541) | (6,668)
Construction loans | Commercial Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 514,833 | 614,386
Construction loans | Commercial Portfolio Segment | Senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 449,733 | 518,992
Construction loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 65,100 | 95,394
Completed construction | Commercial Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | $ 241,800 |
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 | $ 24,600 |
Percentage of construction loans | 5.00% |
Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | $ 68,129 | 88,893
Allowance for loan losses | (1,643) | (265)
Loans | Commercial Portfolio Segment | Senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 35,922 | 53,592
Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | 20,567 | 24,424
Loans | Commercial Portfolio Segment | Subordinate mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Subtotal - gross carrying value of loans | $ 11,640 | $ 10,877

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