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Intangible Assets (Details) (Core Deposit Intangible Asset, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Core Deposit Intangible Asset
         
Intangible assets          
Gross Carrying Amount $ 4,795 $ 4,795      
Accumulated Amortization (4,795) (4,660)      
Net Amount   $ 135 $ 236 $ 337 $ 543