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Goodwill and Other Intangible Assets - Remaining Estimated Core Deposit Intangible Amortization (Detail) - Core Deposit Intangibles [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 1,324
2019 1,228
2020 1,228
2021 969
2022 280
Thereafter $ 145