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 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Receivables [Abstract]      
Interest Income That Would Have Been Recognized Had Impaired Loans Performed in Accordance with Their Original Terms $ 1,068 $ 1,428  
Less: Interest Income Recognized on Impaired Loans (896) (1,106) (4,541)
Interest Foregone on Impaired Loans $ 172 $ 322