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Equity Securities at Fair Value (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt and Equity Securities, FV-NI [Line Items]            
Equity securities $ 1,765,000   $ 1,765,000     $ 1,890,000
Cumulative effect of new accounting principle in period of adoption         $ (548,000)  
(Decrease)/increase in fair value of equity securities $ (59,000) $ 0 189,000 $ 0    
Number of equity securities sold | security 1          
Proceeds from sales of equity securities $ 161,000 $ 0 926,000 $ 0    
Equity securities, realized gain $ 70,000   196,000      
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)  
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)