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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of summary of employee benefits charged to operating expenses
    Three Months Ended March 31,  
(in thousands)   2017     2016  
Payroll taxes   $ 356     $ 296  
Medical plans     426       512  
401k match and profit sharing     250       181  
Pension plan     352       307  
Other     16       16  
Total employee benefits   $ 1,400     $ 1,312  
Schedule of components of net pension cost
    Estimated     Actual  
(in thousands)   2017     2016  
Service cost - benefits earned during the year   $ 1,343     $ 1,179  
Interest costs on projected benefit obligations     1,008       956  
Expected return on plan assets     (1,123 )     (1,057 )
Expected administrative expenses     88       70  
Amortization of prior service cost     79       79  
Amortization of unrecognized net loss     11       0  
Net periodic pension expense   $ 1,406     $ 1,227  
                 
Pension expense - three months ended March 31, (actual)   $ 352     $ 307