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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
2018 $ 303  
2019 1,033  
2020 1,002  
2021 978  
2022 955  
Thereafter 5,377  
Net Carrying Amount 9,648 $ 1,279
MSRs [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
2018 22  
2019 88  
2020 88  
2021 87  
2022 87  
Thereafter 1,307  
Net Carrying Amount 1,679 743
Core deposit intangibles [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
2018 281  
2019 945  
2020 914  
2021 891  
2022 868  
Thereafter 4,070  
Net Carrying Amount $ 7,969 $ 536