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Accumulated Other Comprehensive Income (Loss) (Significant Amounts Reclassified Out Of Each Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized gains on sales of securities $ 348 $ 284 $ 626
Income tax expense (6,551) (1,884) (1,632)
Net income 8,198 6,711 $ 5,908
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense [1] (118) (99)  
Net income [1] 230 185  
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized gains (losses) on available for sale securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized gains on sales of securities [1] $ 348 $ 284  
[1] Amounts in parentheses indicate debits to net income.