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Benefit Plans (Changes in the defined benefit pension plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation      
Benefit obligation, January 1 $ 10,209 $ 9,412  
Interest cost 306 378 $ 388
Actuarial (gain) loss 682 1,216  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 839 797  
Benefit obligation, December 31 10,358 10,209 9,412
Change in plan assets      
Fair value of plan assets, January 1 8,352 7,765  
Investment return 750 1,384  
Contributions 0 0  
Defined Benefit Plan, Plan Assets, Benefits Paid 839 797  
Fair value of plan assets, December 31 8,263 8,352 7,765
Deficiency in funded status at December31, included on the consolidated balance sheets in accrued interest payable and other liabilities (2,095) (1,857)  
Defined Benefit Plan, Accumulated Benefit Obligation 10,358 10,209  
Accrued benefit cost at January 1 (1,857) (1,647)  
Contributions 0 0  
Net periodic cost for the year (176) (268) (345)
Net change in unrecognized actuarial loss and prior service cost (62) 58 610
Accrued benefit cost at December 31 $ (2,095) $ (1,857) $ (1,647)