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Goodwill and Other Intangible Assets - Remaining Estimated Core Deposit Intangible Amortization (Detail) - Core Deposit Intangibles [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 5,723
2020 5,723
2021 5,465
2022 4,776
2023 4,269
Thereafter $ 3,324