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Employee Benefit Plans - Narrative (Details)
 9 Months Ended
Sep. 30, 2017
USD ($)
employee
post_retirement_benefit_plan
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Retirement Benefits, Description [Abstract]      
Requisite period of service (months) 3 months    
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution 3.00%    
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee     2.00%
Expense related to 401(k) plan $ 364,000 $ 338,000  
Unfunded, supplemental retirement benefits payable period (years) 20 years    
Pension expense $ 161,000 161,000  
Accrued pension liability $ 3,040,000 $ 3,072,000 $ 3,073,000
Number of post retirement benefit plans (post retirement benefit plan) | post_retirement_benefit_plan 2    
Number of employees currently eligible (employee) | employee 7    
Requisite age (in years) 50 years    
Post-retirement benefit plan health insurance subsidy range minimum per month per person $ 40    
Post-retirement benefit plan health insurance subsidy range maximum per month per person $ 1,200    
Discount rate 4.25%    
Assumed health care cost trend rate 7.00%    
Expected future benefit payments, current year $ 126,000    
Estimated plan expense 77,000    
Effect of one percentage point increase on accumulated benefit obligation 100,000    
Effect of one percentage point increase on interest cost 7,000    
Effect of one percentage point increase on service cost $ 1,000