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Equity Securities at Fair Value - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2017
Jan. 01, 2019
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value   $ 2,855,000 $ 1,890,000    
Increase (decrease) in fair value of equity securities $ 0 305,000 0 $ 0  
Proceeds from sale of equity securities 92,000 1,100,000 0 $ 0  
Gross realized gain in equity securities 0 236,000      
Gross realized losses in equity securities $ 60,000 $ 0      
Accounting Standards Update 2016-01          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value     $ 1,900,000    
Reclassification of tax effect resulting from adoption         $ 0
Retained Earnings | Accounting Standards Update 2016-01          
Debt and Equity Securities, FV-NI [Line Items]          
Reclassification of tax effect resulting from adoption         $ 548,000