Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]      
Interest Income That Would Have Been Recognized Had Impaired Loans Performed in Accordance with Their Original Terms $ 5,887 $ 9,192 $ 20,848
Less: Interest Income Recognized on Impaired Loans (4,541) (8,348) (11,473)
Interest Foregone on Impaired Loans $ 1,346 $ 844 $ 9,375