Quarterly report pursuant to Section 13 or 15(d)

Summary of Interest Foregone on Impaired Loans (Detail)

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Summary of Interest Foregone on Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest Income That Would Have Been Recognized Had Impaired Loans Performed in Accordance With Their Original Terms $ 1,382 $ 3,063 $ 4,315 $ 7,143
Less: Interest Income Recognized on Impaired Loans (1,111) (1,522) (3,456) (2,815)
Interest Foregone on Impaired Loans $ 271 $ 1,541 $ 859 $ 4,328