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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]    
2018 $ 152  
2019 129  
2020 112  
2021 109  
2022 109  
Thereafter 668  
Net Carrying Amount 1,279 $ 1,784
MSRs [Member]    
Acquired Finite Lived Intangible Assets [Line Items]    
2018 41  
2019 41  
2020 41  
2021 41  
2022 41  
Thereafter 538  
Net Carrying Amount 743 662
Core deposit intangibles [Member]    
Acquired Finite Lived Intangible Assets [Line Items]    
2018 111  
2019 88  
2020 71  
2021 68  
2022 68  
Thereafter 130  
Net Carrying Amount $ 536 $ 1,122