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Premises and Equipment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 4,034 $ 3,982 $ 4,091
Lease expense 1,260 1,170 1,200
Related Parties
     
Property, Plant and Equipment [Line Items]      
Lease expense $ 171 $ 164