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Goodwill and Other Intangible Assets - Remaining Estimated Core Deposit Intangible Amortization (Detail) - Core Deposit Intangibles - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
2020 $ 5,723  
2021 5,465  
2022 4,776  
2023 4,269  
2024 2,482  
Thereafter 842  
Total $ 23,557 $ 29,280