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Goodwill and Other Intangible Assets - Summary of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance of intangible assets, Gross CDI Carrying Amount, Beginning of period $ 41,097 $ 37,940  
Additions due to acquisitions 52,200 3,157  
Balance of intangible assets, Gross CDI Carrying Amount, End of period 93,297 41,097 $ 37,940
Aggregate amortization expense, Gross CDI Carrying Amount 5,254 1,329 1,106
Estimated Amortization Expense:      
Estimated Amortization Expense, 2019 10,798    
Estimated Amortization Expense, 2020 9,352    
Estimated Amortization Expense, 2021 8,240    
Estimated Amortization Expense, 2022 7,126    
Estimated Amortization Expense, Thereafter 18,268    
Balance of intangible assets, Accumulated Amortization, Beginning of period (34,259) (32,930)  
Balance of intangible assets, Accumulated Amortization, End of period (39,513) (34,259) (32,930)
Balance of intangible assets, Net CDI Amount, Beginning of period 6,838 5,010  
Balance of intangible assets, Net CDI Amount, End of period $ 53,784 $ 6,838 $ 5,010