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Accumulated Other Comprehensive Income (Items Reclassified Out of Each Component of OCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized gains on sales of securities $ 284 $ 626 $ 1,170
Income tax expense (1,884) (1,632) (2,606)
Net income 6,711 5,908 $ 7,657
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense [1] (99) (213)  
Net income [1] 185 413  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains on available for sale securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized gains on sales of securities [1] $ 284 $ 626  
[1] Amounts in parentheses indicate debits to net income.