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Retirement Plans - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Average service period   5 years    
Comprehensive loss position $ 404,000 $ (189,000) $ 404,000 $ (371,000)
Pension plan        
Defined Benefit Plan Disclosure [Line Items]        
Estimated contribution to the pension plan   $ 165,000    
Assumptions used in determining periodic pension cost:        
Rate of increase in periodic pension costs   4.20% 3.65%  
Expected long-term rate of return on plan assets   7.50% 7.50%  
Pension plan | Equities        
Current investment policy targets:        
Current investment mix   64.00% 57.00%  
Pension plan | Debt        
Current investment policy targets:        
Current investment mix   35.00% 37.00%  
Pension plan | Money market funds        
Current investment policy targets:        
Current investment mix   1.00% 6.00%  
SERP        
Defined Benefit Plan Disclosure [Line Items]        
Comprehensive loss position $ 328,000 $ (43,000) $ 328,000 $ 214,000
Assumptions used in determining actuarial present value of projected benefits obligation:        
Weighted-average discount rate   4.05% 3.40% 3.90%
Rate of increase in future compensation levels   0.00% 0.00% 3.50%