XML 50 R97.htm IDEA: XBRL DOCUMENT v2.4.1.9
Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]      
Potential cash consideration remaining to be paid $ 0us-gaap_BusinessCombinationContingentConsiderationLiability    
Amortization expense for other intangible assets $ 787us-gaap_AmortizationOfIntangibleAssets $ 729us-gaap_AmortizationOfIntangibleAssets $ 804us-gaap_AmortizationOfIntangibleAssets
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 1 year    
Core deposit intangible assets | Maximum      
Goodwill [Line Items]      
Estimated useful lives of intangibles 11 years    
Remaining lives of intangible assets 11 years