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Unsecured Lines of Credit Narrative (Details) - USD ($)
1 Months Ended
May 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Apr. 30, 2017
Dec. 31, 2016
Line Of Credit Facility [Line Items]          
Lines of credit         $ 40,000,000
Unsecured Lines of Credit [Member]          
Line Of Credit Facility [Line Items]          
Line of credit facility maximum borrowing capacity     $ 60,000,000   47,500,000
Lines of credit         $ 40,000,000
Bankers Trust [Member] | Unsecured Lines of Credit [Member]          
Line Of Credit Facility [Line Items]          
Line of credit facility, increase in borrowing capacity       $ 10,000,000  
Line of credit facility maximum borrowing capacity       50,000,000  
Line of credit facility extension term 1 year        
Bankers Trust Operating [Member]          
Line Of Credit Facility [Line Items]          
Lines of credit     $ 0    
Bankers Trust Operating [Member] | Scenario, Forecast [Member]          
Line Of Credit Facility [Line Items]          
Lines of credit   $ 0      
Bankers Trust Operating [Member] | Unsecured Lines of Credit [Member]          
Line Of Credit Facility [Line Items]          
Line of credit facility maximum borrowing capacity $ 10,000,000     $ 7,500,000  
Line of credit facility extension term 1 year