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Benefit Plans (Changes in the defined benefit pension plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in benefit obligation      
Benefit obligation, January 1 $ 11,381 $ 11,448  
Interest cost 388 444 $ 485
Actuarial (gain) loss (1,194) 578  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 1,163 1,089  
Benefit obligation, December 31 9,412 11,381 11,448
Change in plan assets      
Fair value of plan assets, January 1 9,469 9,325  
Investment return (541) 1,033  
Contributions 0 200  
Defined Benefit Plan, Plan Assets, Benefits Paid 1,163 1,089  
Fair value of plan assets, December 31 7,765 9,469 9,325
Deficiency in funded status at December31, included on the consolidated balance sheets in accrued interest payable and other liabilities (1,647) (1,912)  
Accrued benefit cost at January 1 (1,912) (2,123)  
Contributions 0 200  
Net periodic cost for the year (345) (412) (238)
Net change in unrecognized actuarial loss and prior service cost 610 423 520
Accrued benefit cost at December 31 $ (1,647) $ (1,912) $ (2,123)