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Loans and Allowance for Loan Losses - Summary of Nonperforming and Restructured Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Summary Of Nonperforming And Restructured Assets [Abstract]      
Past due 90 days or more and still accruing $ 1,266 $ 537 $ 731
Nonaccrual 15,094 20,549 22,101
Restructured 18,028 17,866 17,784
Total nonperforming and restructured loans 34,388 38,952 40,616
Other real estate owned and repossessed assets 8,428 9,566 9,796
Total nonperforming and restructured assets $ 42,816 $ 48,518 $ 50,412
Nonperforming and restructured loans to total loans 1.02% 1.20% 1.30%
Nonperforming and restructured assets to total assets 0.72% 0.81% 0.86%