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Other Real Estate Owned Carrying Value and Write Downs (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate, Write-down or Reserve [Line Items]      
Carrying value of other real estate owned $ 26,203 $ 10,956  
Other Real Estate Owned
     
Real Estate, Write-down or Reserve [Line Items]      
Carrying value of other real estate owned 26,203 10,956 11,969
Other real estate owned writedowns $ 1,719 $ 917 $ 1,127