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Equity Method Investment (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Feb. 25, 2016
story
Schedule of Equity Method Investments [Line Items]            
Investment in equity method investment during period     $ 3,127,000 $ 715,000    
Equity method investments $ 14,538,000   14,538,000   $ 11,411,000  
Construction loan outstanding 580,446,000   580,446,000   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     3,200,000      
Investment in equity method investments 13,800,000   13,800,000   10,900,000  
Equity method investments 14,500,000   14,500,000   11,400,000  
Guarantee of construction loan           37.00%
Assets being used as collateral for the construction loan           100.00%
Construction loan outstanding 13,200,000   13,200,000   11,200,000  
Dividends from equity investment 0 $ 0 0 0    
Income from equity method investment 0 $ 0 0 $ 0    
City Center | 22-Story Mixed Use Tower | City Center            
Schedule of Equity Method Investments [Line Items]            
Construction loan outstanding $ 38,900,000   $ 38,900,000   $ 29,200,000