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Accumulated Other Comprehensive Income (Items Reclassified Out of Each Component of OCI) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net realized gains on sales of securities $ 138 $ 402
Income tax expense (569) (795)
Net Income 2,308 2,186
Amount Reclassified To From Accumulated Other Comprehensive Income [Member]
    
Income tax expense (47) [1]  
Net Income 91 [1]  
Amount Reclassified To From Accumulated Other Comprehensive Income [Member] | Unrealized gains on available for sale securities [Member]
    
Net realized gains on sales of securities $ 138 [1]  
[1] (a) Amounts in parentheses indicate debits to net income