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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Service cost - benefits earned during the period $ 29 $ 27
Interest cost 387 435
Expected return on plan assets (103) (675)
Amortization of net (gain)/loss 52 51
Net periodic pension (income)/cost 365 (162)
Pension Plan [Member]    
Service cost - benefits earned during the period
Interest cost 330 375
Expected return on plan assets (103) (675)
Amortization of net (gain)/loss 60 60
Net periodic pension (income)/cost 287 (240)
SERP [Member]    
Service cost - benefits earned during the period 29 27
Interest cost 57 60
Expected return on plan assets
Amortization of net (gain)/loss (8) (9)
Net periodic pension (income)/cost $ 78 $ 78