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Goodwill and Other Intangible Assets - Estimated Amortization Expense for Core Deposit and Customer Related Intangibles (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2016 $ 1,871
2017 1,544
2018 1,170
2019 847
2020 577
Thereafter $ 734