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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-Sale Securities |  |
Amortized Cost Basis | $ 21,185 |
Estimated Fair Value | 21,282 |
Held-to-Maturity Securities |  |
Amortized Cost Basis | 98,490 |
Estimated Fair Value | 100,130 |
Investments, Debt and Equity Securities [Abstract] |  |
Face Value | 141,380 | $ 87,848
Amortized Cost Basis | 119,675 | 87,964
Net Unrealized Gain | 1,737 | 3,193
Estimated Fair Value | 121,412 | 91,157
Net Carrying Value | 119,772 | 89,576
Municipal debt securities |  |
Available-for-Sale Securities |  |
Face Value | 21,185 | 21,230
Amortized Cost Basis | 21,185 | 21,230
Net Unrealized Gain | 97 | 1,612
Estimated Fair Value | 21,282 | 22,842
Net Carrying Value | 21,282 | 22,842
Debt securities |  |
Held-to-Maturity Securities |  |
Face Value | 120,195 | 66,618
Amortized Cost Basis | 98,490 | 66,734
Net Unrealized Gain | 1,640 | 1,581
Estimated Fair Value | 100,130 | 68,315
Net Carrying Value | $ 98,490 | $ 66,734

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