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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]      
Potential cash consideration remaining to be paid $ 353    
Amortization expense for other intangible assets $ 729 $ 804 $ 1,020
Core deposit intangible assets
      
Goodwill [Line Items]      
Weighted average remaining life of intangibles 4 years    
Core deposit intangible assets | Minimum
      
Goodwill [Line Items]      
Estimated useful lives of intangibles 7 years    
Remaining lives of intangible assets 2 years    
Core deposit intangible assets | Maximum
      
Goodwill [Line Items]      
Estimated useful lives of intangibles 10 years    
Remaining lives of intangible assets 5 years