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Employee Benefit Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
employee
post_retirement_benefit_plan
Mar. 31, 2013
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Requisite period of service P3M    
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 $ 116,000 $ 97,000  
Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death 20 years    
Pension expense 94,000 77,000  
Accrued pension liability 2,413,000 2,143,000 2,333,000
Number of post retirement benefit plans 2    
Number of employees currently eligible 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 4.50%    
Assumed health care cost trend rate (in hundredths) 7.00%    
Expected future benefit payments, next quarter 26,000    
Expected future benefit payments, current year 102,000    
Estimated plan expense 112,000    
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    
Maximum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths) 3.00%