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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-Sale Securities |  |
Amortized Cost Basis | $ 21,185 |
Estimated Fair Value | 21,840 |
Held-to-Maturity Securities |  |
Amortized Cost Basis | 96,525 |
Estimated Fair Value | 96,903 |
Investments, Debt and Equity Securities [Abstract] |  |
Face Value | 140,723 | $ 87,848
Amortized Cost Basis | 117,710 | 87,964
Net Unrealized Gain | 1,033 | 3,193
Estimated Fair Value | 118,743 | 91,157
Net Carrying Value | 118,365 | 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 | 655 | 1,612
Estimated Fair Value | 21,840 | 22,842
Net Carrying Value | 21,840 | 22,842
Debt securities |  |
Held-to-Maturity Securities |  |
Face Value | 119,538 | 66,618
Amortized Cost Basis | 96,525 | 66,734
Net Unrealized Gain | 378 | 1,581
Estimated Fair Value | 96,903 | 68,315
Net Carrying Value | $ 96,525 | $ 66,734

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