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Benefit Plans (Changes in the defined benefit pension plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation      
Benefit obligation, January 1 $ 9,412 $ 11,381  
Interest cost 378 388 $ 444
Actuarial (gain) loss 1,216 (1,194)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 797 1,163  
Benefit obligation, December 31 10,209 9,412 11,381
Change in plan assets      
Fair value of plan assets, January 1 7,765 9,469  
Investment return 1,384 (541)  
Contributions 0 0  
Defined Benefit Plan, Plan Assets, Benefits Paid 797 1,163  
Fair value of plan assets, December 31 8,352 7,765 9,469
Deficiency in funded status at December31, included on the consolidated balance sheets in accrued interest payable and other liabilities (1,857) (1,647)  
Accrued benefit cost at January 1 (1,647) (1,912)  
Contributions 0 0  
Net periodic cost for the year (268) (345) (412)
Net change in unrecognized actuarial loss and prior service cost 58 610 423
Accrued benefit cost at December 31 $ (1,857) $ (1,647) $ (1,912)