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Equity Method Investment (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Feb. 25, 2016
story
Schedule of Equity Method Investments [Line Items]        
Investment in equity method investment during period $ 1,410,000 $ 559,000    
Equity method investments 12,821,000   $ 11,411,000  
Construction loan outstanding 589,634,000   517,272,000  
22-Story Mixed Use Tower | City Center        
Schedule of Equity Method Investments [Line Items]        
Interests in equity method investments       37.00%
Number stories in the mixed use tower (story) | story       22
Investment in equity method investment during period 1,300,000      
Investment in equity method investments 12,200,000   10,900,000  
Equity method investments 12,800,000   11,400,000  
Guarantee of construction loan       37.00%
Assets being used as collateral for the construction loan       100.00%
Construction loan outstanding 12,300,000   11,200,000  
Dividends from equity investment 0 0    
Income from equity method investment 0 $ 0    
City Center | 22-Story Mixed Use Tower | City Center        
Schedule of Equity Method Investments [Line Items]        
Construction loan outstanding $ 33,000,000   $ 29,200,000