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Loans Receivable and Other Lending Investments, net (Other Lending Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-Sale Securities
Amortized Cost Basis	$ 23,855
Estimated Fair Value	27,535
Held-to-Maturity Securities
Amortized Cost Basis	95,258
Estimated Fair Value	95,258
Total Other Lending Investments
Face Value	123,855	$ 120,680
Amortized Cost Basis	119,113	111,395
Net Unrealized Gain	3,680	4,594
Estimated Fair Value	122,793	115,989
Net Carrying Value	122,793	115,989
Municipal debt securities
Available-for-Sale Securities
Face Value	23,855	20,680
Amortized Cost Basis	23,855	20,680
Net Unrealized Gain	3,680	4,594
Estimated Fair Value	27,535	25,274
Net Carrying Value	27,535	25,274
Debt securities
Held-to-Maturity Securities
Face Value	100,000	100,000
Amortized Cost Basis	95,258	90,715
Estimated Fair Value	95,258	90,715
Net Carrying Value	$ 95,258	$ 90,715

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