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Condensed Financial Statements Of Parent Company (Condensed Balance Sheet Of Parent Company) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]      
Taxes receivable $ 1,366 $ 1,214  
Other assets 925 922  
Total assets 626,341 574,195  
Capital notes 5,000    
Total liabilities 574,676 524,774  
Common stock $2.14 par value 9,370 9,370  
Additional paid-in-capital 31,495 31,495  
Retained earnings 12,269 10,156  
Accumulated other comprehensive (loss) (1,469) (1,600)  
Total stockholders' equity 51,665 49,421 $ 48,196
Total liabilities and stockholders' equity $ 626,341 $ 574,195  
Common stock, par value $ 2.14 $ 2.14  
Parent Company [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Cash $ 859 $ 281  
Taxes receivable 120 73  
Investments in subsidiaries 55,668 49,049  
Other assets 18 18  
Total assets 56,665 49,421  
Capital notes 5,000    
Total liabilities 5,000    
Common stock $2.14 par value 9,370 9,370  
Additional paid-in-capital 31,495 31,495  
Retained earnings 12,269 10,156  
Accumulated other comprehensive (loss) (1,469) (1,600)  
Total stockholders' equity 51,665 49,421  
Total liabilities and stockholders' equity $ 56,665 $ 49,421  
Common stock, par value $ 2.14 $ 2.14