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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Summary of employee benefits charged to operating expenses
    Three Months Ended June 30,     Six Months Ended June 30,  
(in thousands)   2014     2013     2014     2013  
Payroll taxes   $ 275     $ 262     $ 568     $ 566  
Medical plans     484       469       1,002       960  
401k match and profit sharing     176       115       329       190  
Pension plan     236       286       472       572  
Other     28       33       39       80  
                                 
Total employee benefits   $ 1,199     $ 1,165     $ 2,410     $ 2,368  
Schedule of components of net pension cost
 
    Estimated     Actual  
(in thousands)   2014     2013  
Service cost - benefits earned during the year   $ 981     $ 1,174  
Interest costs on projected benefit obligations     732       646  
Expected return on plan assets     (887 )     (797 )
Expected administrative expenses     40       40  
Amortization of prior service cost     79       79  
Amortization of unrecognized net loss     0       31  
Net periodic pension expense   $ 945     $ 1,173  
                 
Pension expense - three months ended June 30, (actual)   $ 236     $ 286  
Pension expense - six months ended June 30, (actual)   $ 472     $ 572