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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]    
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax $ (182)  
Other Comprehensive Income (Loss), Net of Tax (187)  
Decreases to fair market value during period (214)  
Decreases due to realization of a gain (6)  
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax (220)  
Accumulated Other Comprehensive Income Net Of Tax (185) 2
Accumulated Other Comprehensive Income Loss (218) 2
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax $ (5)