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Retirement Benefit Plans (Schedule of Defined Benefit Plans Disclosures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in fair value of plan assets      
Fair value of plan assets at beginning of year $ 20,605  
Fair value of plan assets at end of year 22,370 $ 20,605
Pension Plan    
Change in projected benefit obligation     
Benefit obligation at beginning of year 22,449 20,050
Service cost 4 3
Interest cost 689 819
Liability actuarial (gain) loss 2,025 2,604
Benefits paid (1,067) (1,027)
Benefit obligation at end of year 24,100 22,449
Change in fair value of plan assets      
Fair value of plan assets at beginning of year 20,605 18,106
Return on plan assets 2,832 3,526
Employer contributions 0 0
Benefits paid (1,067) (1,027)
Fair value of plan assets at end of year 22,370 20,605
Funded status (1,730) (1,844)
Supplemental Employee Retirement Plan    
Change in projected benefit obligation     
Benefit obligation at beginning of year 9,022 7,446
Service cost 305 240
Interest cost 236 298
Liability actuarial (gain) loss 1,168 1,193
Benefits paid (1,025) (155)
Plan amendments 454 0
Benefit obligation at end of year $ 10,160 $ 9,022