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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Service cost - benefits earned during the period $ 29 $ 27 $ 88 $ 80
Interest cost 418 435 1,256 1,305
Expected return on plan assets (702) (675) (2,107) (2,025)
Amortization of transition obligation
Amortization of net (gain)/loss 53 50 158 152
Amortization of prior service cost
Net periodic pension (income)/cost (202) (163) (605) (488)
Pension Plan [Member]        
Service cost - benefits earned during the period
Interest cost 361 375 1,086 1,127
Expected return on plan assets (702) (675) (2,107) (2,025)
Amortization of transition obligation
Amortization of net (gain)/loss 61 59 183 179
Amortization of prior service cost
Net periodic pension (income)/cost (280) (241) (838) (719)
SERP [Member]        
Service cost - benefits earned during the period 29 27 88 80
Interest cost 57 60 170 178
Expected return on plan assets
Amortization of transition obligation
Amortization of net (gain)/loss (8) (9) (25) (27)
Amortization of prior service cost
Net periodic pension (income)/cost $ 78 $ 78 $ 233 $ 231