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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Total $ 21,230  
Estimated Fair Value 22,842  
Held-to-Maturity Securities, Debt Maturities [Abstract]    
Total 66,734  
Estimated Fair Value 68,315  
Investments, Debt and Equity Securities [Abstract]    
Face Value 87,848 $ 79,694
Amortized Cost Basis 87,964 79,490
Net Unrealized Gain (Loss) 3,193 3,179
Estimated Fair Value 91,157 82,669
Net Carrying Value 89,576 79,916
Municipal Bonds    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Face Value 21,230 21,240
Total 21,230 21,240
Net Unrealized Gain (Loss) 1,612 426
Estimated Fair Value 22,842 21,666
Net Carrying Value 22,842 21,666
Corporate Debt Securities    
Held-to-Maturity Securities, Debt Maturities [Abstract]    
Face Value 66,618 58,454
Total 66,734 58,250
Net Unrealized Gain 1,581 2,753
Estimated Fair Value 68,315 61,003
Net Carrying Value $ 66,734 $ 58,250