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Loans Receivable and Other Lending Investments, net (Other Lending Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-Sale Securities |  |
Amortized Cost Basis | $ 20,480 |
Estimated Fair Value | 24,043 |
Held-to-Maturity Securities |  |
Amortized Cost Basis | 92,196 |
Estimated Fair Value | 92,196 |
Total Other Lending Investments |  |
Face Value | 120,480 | $ 120,680
Amortized Cost Basis | 112,676 | 111,395
Net Unrealized Gain | 3,563 | 4,594
Estimated Fair Value | 116,239 | 115,989
Net Carrying Value | 116,239 | 115,989
Municipal debt securities |  |
Available-for-Sale Securities |  |
Face Value | 20,480 | 20,680
Amortized Cost Basis | 20,480 | 20,680
Net Unrealized Gain | 3,563 | 4,594
Estimated Fair Value | 24,043 | 25,274
Net Carrying Value | 24,043 | 25,274
Debt securities |  |
Held-to-Maturity Securities |  |
Face Value | 100,000 | 100,000
Amortized Cost Basis | 92,196 | 90,715
Net Unrealized Gain | 0 | 0
Estimated Fair Value | 92,196 | 90,715
Net Carrying Value | $ 92,196 | $ 90,715

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