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Goodwill and Other Amortizing Intangible Assets - Estimated Amortization Expense of Core Deposit Intangibles (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Other Intangibles [Line Items]    
2016 $ 375  
2017 220  
2018 186  
2019 155  
2020 77  
Thereafter 218  
Net Intangible Assets 1,231 $ 1,665
Customer list intangible    
Goodwill And Other Intangibles [Line Items]    
2016 168  
2017 130  
2018 99  
2019 77  
2020 59  
Thereafter 175  
Net Intangible Assets 708 $ 968
Customer deposit intangibles    
Goodwill And Other Intangibles [Line Items]    
2016 207  
2017 90  
2018 87  
2019 78  
2020 18  
Thereafter 43  
Net Intangible Assets $ 523