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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Location
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]      
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 355 $ 291  
Number of location of banking operations | Location 30    
Period for federal fund sold 1 day    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of mortgages serviced for others $ 259,481 266,789  
Capitalized mortgage loans on real estate carrying amount 2,435 2,409  
Corporation recorded servicing fee revenue 651 671 $ 696
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Present value of the post retirement benefits payable 2,751 2,751  
Periodic policy maintenance costs $ 0 $ 577 $ (8)
Director [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Eligible shares, total | shares 220,171 226,909  
Common stock, shares held in Rabbi Trust | shares 16,673 31,769  
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful lives of the related assets 3 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful lives of the related assets 40 years    
Commercial, Agricultural, and Residential Portfolio Segments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days past due (or more), accrual of interest discontinued 90 days    
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum days of consumer loan charged off 180 days