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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of employee benefits charged to operating expenses
    Three Months Ended September 30,     Nine Months Ended September 30,  
(in thousands)   2015     2014     2015     2014  
Payroll taxes   $ 261     $ 272     $ 860     $ 840  
Medical plans     491       510       1,462       1,512  
401k match and profit sharing     225       159       720       488  
Pension plan     348       236       1,044       708  
Other     56       42       99       81  
Total employee benefits   $ 1,381     $ 1,219     $ 4,185     $ 3,629  
Schedule of components of net pension cost
    Estimated     Actual  
(in thousands)   2015     2014  
Service cost - benefits earned during the year   $ 1,325     $ 981  
Interest costs on projected benefit obligations     838       732  
Expected return on plan assets     (957 )     (872 )
Expected administrative expenses     40       40  
Amortization of prior service cost     79       79  
Amortization of unrecognized net loss     66       0  
Net periodic pension expense   $ 1,391     $ 960  
                 
Pension expense - three months ended September 30, (actual)   $ 348     $ 236  
Pension expense - nine months ended September 30, (actual)   $ 1,044     $ 708