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Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Service cost $ 29
Interest cost 413 387
Expected return on plan assets (397) (103)
Amortization of net (gain)/loss 228 52
Net periodic pension cost 244 365
Pension Plan [Member]    
Service cost
Interest cost 372 330
Expected return on plan assets (397) (103)
Amortization of net (gain)/loss 223 60
Net periodic pension cost 198 287
SERP [Member]    
Service cost 29
Interest cost 41 57
Expected return on plan assets
Amortization of net (gain)/loss 5 (8)
Net periodic pension cost $ 46 $ 78