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Major Categories of Other Real Estate Owned (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]        
Other Real Estate Owned, Gross $ 46,126 $ 31,122    
Valuation allowance (208) (230) (928) (1,154)
Other real estate owned 45,918 30,892 44,192 43,671
Commercial Real Estate | Construction, Land Development and Other Land
       
Real Estate Properties [Line Items]        
Other Real Estate Owned, Gross 19,408 19,199    
Commercial Real Estate | Farmland
       
Real Estate Properties [Line Items]        
Other Real Estate Owned, Gross 950 695    
Commercial Real Estate | Other
       
Real Estate Properties [Line Items]        
Other Real Estate Owned, Gross 7,258 6,064    
Residential Real Estate | Multi-Family
       
Real Estate Properties [Line Items]        
Other Real Estate Owned, Gross 6,852 248    
Residential Real Estate | 1-4 Family
       
Real Estate Properties [Line Items]        
Other Real Estate Owned, Gross $ 11,658 $ 4,916