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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
Benefits paid   $ 2,565 $ 2,341  
Defined contribution plan, contribution amount   $ 1,378 1,109 $ 925
Fixed Income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset   51.00%    
U.S. Equity [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset   19.00%    
Non-U.S. Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset   30.00%    
Defined Benefit Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   $ 103,736 83,724  
Contributions for plan   6,900    
Net gains (losses) as a component of net periodic benefit cost   0    
Defined Benefit Plan [Member] | Subsequent Event [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net gains (losses) as a component of net periodic benefit cost $ 1,890      
Supplemental Executive Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   10,485 8,830  
Benefits paid   262 260 247
Net gains (losses) as a component of net periodic benefit cost   0    
Supplemental Executive Retirement Plan [Member] | Subsequent Event [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net gains (losses) as a component of net periodic benefit cost $ 112      
Noncontributory Profit Sharing Program [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contributions for plan   $ 6,841 $ 6,810 $ 5,799