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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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