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Loans and Allowance for Loan Losses - Summary of Nonperforming and Restructured Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Summary Of Nonperforming And Restructured Assets [Abstract]      
Past due 90 days or more and still accruing $ 850 $ 537 $ 1,403
Nonaccrual 18,946 20,549 20,702
Restructured 17,903 17,866 18,089
Total nonperforming and restructured loans 37,699 38,952 40,194
Other real estate owned and repossessed assets 8,503 9,566 10,223
Total nonperforming and restructured assets $ 46,202 $ 48,518 $ 50,417
Nonperforming and restructured loans to total loans 1.16% 1.20% 1.31%
Nonperforming and restructured assets to total assets 0.80% 0.81% 0.89%