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Employee Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, discretionary contribution by employer $ 0 $ 0 $ 0
Minimum Required Contribution, Next Fiscal Year 0    
Contributions to the CERP 80,000 25,000 $ 24,000
Accumulated benefit obligation $ 127,200,000 $ 120,600,000  
Expected long-term rate of return on pension plan assets 5.00% 5.00% 5.00%
Annualized 10-year return for pension plan 7.10%    
Rate of return 8.90% 14.80%  
Expected pension expense for the upcoming fiscal year $ 439,000    
Pension expense $ 345,000    
Determination of benefit obligation at year end, Discount rate 2.25% 3.07% 4.14%
Equity securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Long-term investment target mix 35.00%    
Fixed Income Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Long-term investment target mix 65.00%    
Change due to discount rate increase/decrease      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Increase (Decrease) in Obligation, Pension Benefits $ (10,400,000)    
Change due to updated mortality projection scale [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Increase (Decrease) in Obligation, Pension Benefits $ (900,000)