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Equity Securities at Fair Value (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities $ 1,428,000     $ 1,890,000  
Cumulative effect of new accounting principle in period of adoption     $ (548,000)   $ 0
Change in fair value of equity securities 176,000 $ 0      
Proceeds from sales of equity securities 0 0      
Proceeds from sales of equity securities 764,000 $ 0      
Equity securities, realized gain 126,000        
Equity securities, realized loss $ 0        
Retained Earnings          
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)    
Accounting Standards Update 2016-01          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities       $ 1,900,000  
Accounting Standards Update 2016-01 | Retained Earnings          
Debt and Equity Securities, FV-NI [Line Items]          
Cumulative effect of new accounting principle in period of adoption     548,000    
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Loss          
Debt and Equity Securities, FV-NI [Line Items]          
Cumulative effect of new accounting principle in period of adoption     $ (548,000)