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Securities - Sales of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Investments Debt And Equity Securities [Abstract]        
Proceeds $ 648    $ 23,853   
Gross gains 6    382   
Gross losses      $ (8)