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Loans Receivable and Other Lending Investments, net - Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-Sale Securities |  |
Amortized Cost Basis | $ 21,140 |
Estimated Fair Value | 22,615 |
Held-to-Maturity Securities |  |
Amortized Cost Basis | 80,905 |
Estimated Fair Value | 80,905 |
Total Other Lending Investments |  |
Face Value | 121,140 | $ 142,051
Amortized Cost Basis | 102,045 | 121,650
Net Unrealized Gain | 1,475 | 483
Estimated Fair Value | 103,520 | 122,133
Net Carrying Value | 103,520 | 122,126
Municipal debt securities |  |
Available-for-Sale Securities |  |
Face Value | 21,140 | 21,185
Amortized Cost Basis | 21,140 | 21,185
Net Unrealized Gain | 1,475 | 476
Estimated Fair Value | 22,615 | 21,661
Net Carrying Value | 22,615 | 21,661
Debt securities |  |
Held-to-Maturity Securities |  |
Face Value | 100,000 | 120,866
Amortized Cost Basis | 80,905 | 100,465
Net Unrealized Gain | 0 | 7
Estimated Fair Value | 80,905 | 100,472
Net Carrying Value | $ 80,905 | $ 100,465

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