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Property Loans, Net of Loan Loss Allowances - Loan Loss Reserves (Parenthetical) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Lake Forest [Member]  
Property Loan Net Of Loan Loss Allowances [Line Items]  
Reversal of allowance for loan loss $ 55,000
Ashley Square [Member]  
Property Loan Net Of Loan Loss Allowances [Line Items]  
Increase in allowance for loan loss $ 350,000