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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Service cost $ 32 $ 27 $ 59 $ 53
Interest cost 403 435 838 870
Expected return on plan assets (730) (675) (1,405) (1,350)
Amortization of transition obligation
Amortization of net (gain)/loss 54 51 105 102
Amortization of prior service cost
Net periodic pension (income)/cost (241) (162) (403) (325)
Pension Plan [Member]        
Service cost
Interest cost 350 376 725 752
Expected return on plan assets (730) (675) (1,405) (1,350)
Amortization of transition obligation
Amortization of net (gain)/loss 62 60 122 120
Amortization of prior service cost
Net periodic pension (income)/cost (318) (239) (558) (478)
SERP [Member]        
Service cost 32 27 59 53
Interest cost 53 59 113 118
Expected return on plan assets
Amortization of transition obligation
Amortization of net (gain)/loss (8) (9) (17) (18)
Amortization of prior service cost
Net periodic pension (income)/cost $ 77 $ 77 $ 155 $ 153