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Goodwill and Other Intangible Assets - Estimated Core Deposit Intangible Amortization (Detail) - Core Deposit Intangibles [Member]
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 $ 1,389
2018 1,324
2019 1,228
2020 1,228
2021 969
Thereafter $ 425