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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | $ 124,930 | $ 115,989 |
Total gross carrying value of loans receivable and other lending investments | 337,613 | 698,951 |
Allowance for loan losses | (4,769) | (12,020) |
Total loans receivable and other lending investments, net | 332,844 | 686,931 |
Held-to-maturity debt securities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | 96,838 | 90,715 |
Available-for-sale debt securities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other lending investments | 28,092 | 25,274 |
Commercial Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 212,683 | 582,962 |
Commercial Portfolio Segment | Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 199,608 | 485,655 |
Commercial Portfolio Segment | Corporate/Partnership loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 618 | 85,667 |
Commercial Portfolio Segment | Subordinate mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 12,457 | 11,640 |
Construction Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 185,261 | 514,833 |
Allowance for loan losses | (1,213) | (6,541) | $ (6,668)
Construction Loans | Commercial Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 185,261 | 514,833 |
Construction Loans | Commercial Portfolio Segment | Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 184,643 | 449,733 |
Construction Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 618 | 65,100 |
Completed construction | Commercial Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of construction loans | 100.00% |  |
Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 27,422 | 68,129 |
Allowance for loan losses | (676) | (1,643) | $ (265)
Loans | Commercial Portfolio Segment | Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | 14,965 | 35,922 |
Loans | Commercial Portfolio Segment | Corporate/Partnership loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans |  | 20,567 |
Loans | Commercial Portfolio Segment | Subordinate mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Subtotal - gross carrying value of loans | $ 12,457 | $ 11,640 |

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