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Retirement Plans - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
Average service period   5 years    
Comprehensive loss position $ 404 $ (135) $ 189 $ (404)
Pension plan        
Defined Benefit Plan Disclosure [Line Items]        
Estimated contribution to the pension plan   $ 165    
Assumptions used in determining periodic pension cost:        
Rate of increase in periodic pension costs   3.20% 4.20%  
Expected long-term rate of return on plan assets   7.30% 7.50%  
Pension plan | Equities        
Current investment policy targets:        
Current investment mix   66.00% 64.00%  
Pension plan | Debt        
Current investment policy targets:        
Current investment mix   33.00% 35.00%  
Pension plan | Money market funds        
Current investment policy targets:        
Current investment mix   1.00% 1.00%  
SERP        
Defined Benefit Plan Disclosure [Line Items]        
Comprehensive loss position $ 328 $ 424 $ 43 $ (328)
Assumptions used in determining actuarial present value of projected benefits obligation:        
Weighted-average discount rate   2.95% 4.05% 3.40%
Rate of increase in future compensation levels   0.00% 0.00% 0.00%