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Loans Receivable and Other Lending Investments, net - Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-Sale Securities
Amortized Cost Basis	$ 21,140
Estimated Fair Value	23,324
Held-to-Maturity Securities
Amortized Cost Basis	82,205
Estimated Fair Value	82,205
Total Other Lending Investments
Face Value	121,140	$ 142,051
Amortized Cost Basis	103,345	121,650
Net Unrealized Gain	2,184	483
Estimated Fair Value	105,529	122,133
Net Carrying Value	105,529	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	2,184	476
Estimated Fair Value	23,324	21,661
Net Carrying Value	23,324	21,661
Debt securities
Held-to-Maturity Securities
Face Value	100,000	120,866
Amortized Cost Basis	82,205	100,465
Net Unrealized Gain	0	7
Estimated Fair Value	82,205	100,472
Net Carrying Value	$ 82,205	$ 100,465

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