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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]      
Amortization expense for other intangible assets $ 1,118 $ 787 $ 729
Core deposit intangible assets      
Goodwill [Line Items]      
Weighted average remaining life of intangibles 9 years    
Core deposit intangible assets | Minimum      
Goodwill [Line Items]      
Estimated useful lives of intangibles 7 years    
Remaining lives of intangible assets 8 months    
Core deposit intangible assets | Maximum      
Goodwill [Line Items]      
Estimated useful lives of intangibles 11 years    
Remaining lives of intangible assets 10 years