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Intangible Assets (Details) (Core Deposit Intangible Asset, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 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 $ 0 $ 34 $ 135 $ 337 $ 439 $ 543