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Goodwill and Other Intangible Assets - Estimated Core Deposit Intangible Amortization (Detail) - Core deposit intangibles [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2016 $ 1,157
2017 1,109
2018 1,044
2019 948
2020 948
Thereafter $ 688