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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Compensation and Retirement Disclosure [Abstract]  
Schedule of employee benefits charged to operating expenses
    Three Months Ended June 30,     Six Months Ended June 30,  
(in thousands)   2018     2017     2018     2017  
Payroll taxes   $ 301     $ 288     $ 652     $ 644  
Medical plans     612       468       1,160       894  
401k match and profit sharing     237       226       423       476  
Periodic pension cost     405       335       810       671  
Other     10       9       25       25  
Total employee benefits   $ 1,565     $ 1,326     $ 3,070     $ 2,710  
Schedule of components of net pension cost
    Pension Benefits  
(in thousands)   2018     2017  
Service cost - benefits earned during the year   $ 1,620     $ 1,343  
Interest costs on projected benefit obligations (a)     1,033       1,009  
Expected return on plan assets (a)     (1,267 )     (1,124 )
Expected administrative expenses (a)     93       88  
Amortization of prior service cost (a)     79       79  
Amortization of unrecognized net loss (a)     138       11  
Net periodic pension cost   $ 1,696     $ 1,406  
                 
Net periodic pension cost for the three months ended June 30, (actual)   $ 405     $ 335  
Net periodic pension cost for the six months ended June 30, (actual)   $ 810     $ 671  

(a) The components of net periodic pension cost other than the service cost component are included in other non-interest expense.