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Benefit Plans - Salary Continuation Plan (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Percentage of salary paid upon retirement 25.00%  
Period before ratable vesting begins 5 years  
Age ratable vesting ends 65 years  
Liability under the Salary Continuation Plan $ 3.0 $ 2.7
Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Payment period determined by service period 7 years  
Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Payment period determined by service period 15 years