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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of employee benefits charged to operating expenses
    Three Months Ended September 30,     Nine Months Ended September 30,  
(in thousands)   2017     2016     2017     2016  
Payroll taxes   $ 267     $ 251     $ 911     $ 883  
Medical plans     595       415       1,489       1,414  
401k match and profit sharing     218       201       694       585  
Pension plan     349       307       1,052       920  
Other     17       56       42       118  
Total employee benefits   $ 1,446     $ 1,230     $ 4,188     $ 3,920  
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     (1,126 )     (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   $ 1,403     $ 1,227  
                 
Pension expense - three months ended September 30, (actual)   $ 349     $ 307  
Pension expense - nine months ended September 30, (actual)   $ 1,052     $ 920