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Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 01, 2007
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]        
Employees contribution   100.00%    
Corporation matching contribution, percent   100.00%    
Employee contribution, percent   5.00%    
Defined Contribution Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   $ (269,000) $ (235,000) $ 0
Plan expenses   743,000 713,000 686,000
Highest consecutive years of compensation 5 years      
Years of service 10 years      
Accumulated other comprehensive income includes net unrecognized pension cost before income taxes   3,470,000    
Accumulated other comprehensive income expected to be amortized into benefit cost   140,000    
Allocated Share-based Compensation Expense   45,000 38,000 70,000
Contribution approved by Board of Directors to the ESOP (Discretionary)   0    
Compensation cost related to plan   $ 21,000 $ 23,000 $ 33,000
Allocated shares outstanding related to the ESOP   0 166,833,000 204,669,000
Corporation self-funded medical plan   $ 75,000    
Medical expenses   2,695,000 $ 2,324,000 $ 2,150,000
Other Postretirement Benefits Plan [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Plan expenses   $ 356,000 $ 473,000 $ 440,000
Safe Harbor 401(k) [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Vesting percentage   100.00%    
Fixed Income Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Investment allocation in securities   50.00%    
Equity Collective Trust [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Investment allocation in securities   50.00%