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Goodwill and Other Intangible Assets - Estimated Amortization Expense for Covenants Not To Compete, Core Deposit and Customer Related Intangibles (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 2,829
2018 2,114
2019 1,565
2020 1,200
2021 923
Thereafter $ 1,535