Quarterly report pursuant to Section 13 or 15(d)

Loans - Summary of Interest Foregone on Impaired Loans (Detail)

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Loans - Summary of Interest Foregone on Impaired Loans (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
Receivables [Abstract]        
Interest income that would have been recognized had impaired loans performed in accordance with their original terms $ 1,058 $ 1,382 $ 3,183 $ 4,315
Less: Interest income recognized on impaired loans (900) (1,111) (2,722) (3,456)
Interest foregone on impaired loans $ 158 $ 271 $ 461 $ 859