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Equity Securities at Fair Value (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Debt and Equity Securities, FV-NI [Line Items]              
Equity securities $ 1,915,000   $ 1,915,000     $ 1,890,000  
Change in fair value of equity securities 71,000 $ 0 247,000 $ 0      
Proceeds from sales of equity securities $ 0 $ 0 765,000 $ 0      
Equity securities, realized gain     126,000        
Equity securities, realized loss     $ 0        
Accounting Standards Update 2016-01              
Debt and Equity Securities, FV-NI [Line Items]              
Equity securities           $ 1,900,000  
Retained Earnings              
Debt and Equity Securities, FV-NI [Line Items]              
Cumulative effect of new accounting principle in period of adoption         $ (548,000)    
Retained Earnings | Accounting Standards Update 2016-01              
Debt and Equity Securities, FV-NI [Line Items]              
Cumulative effect of new accounting principle in period of adoption         (548,000)    
Accumulated Other Comprehensive (Loss)              
Debt and Equity Securities, FV-NI [Line Items]              
Cumulative effect of new accounting principle in period of adoption         548,000   $ 0
Accumulated Other Comprehensive (Loss) | Accounting Standards Update 2016-01              
Debt and Equity Securities, FV-NI [Line Items]              
Cumulative effect of new accounting principle in period of adoption         $ 548,000