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Employee Benefit Plans (Details)
 9 Months Ended
Sep. 30, 2015
USD ($)
employee
post_retirement_benefit_plan
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
General Discussion of Pension and Other Postretirement Benefits [Abstract]      
Requisite period of service (months) 3 months    
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths) 3.00%    
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths)     2.00%
Expense related to 401(k) plan $ 333,000 $ 327,000  
Post Employment Plan, Period of Non-qualified Compensation Payable 2 years    
Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death 20 years    
Pension expense $ 234,000 629,000  
Accrued pension liability $ 3,074,000 $ 2,920,000 $ 2,999,000
Number of post retirement benefit plans | post_retirement_benefit_plan 2    
Number of employees currently eligible | employee 7    
Requisite age 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 (in hundredths) 7.00%    
Expected future benefit payments, next quarter $ 30,000    
Expected future benefit payments, current year 120,000    
Estimated plan expense 80,000    
Effect of one percentage point increase on accumulated benefit obligation 100,000    
Effect of One Percentage Point Increase on Interest Cost Components 7,000    
Effect of One Percentage Point Increase on Service Cost Components $ 1,000