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Goodwill and Other Intangible Assets - Summary of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance of intangible assets, Gross CDI Carrying Amount, Beginning of period $ 93,297 $ 41,097  
Additions due to acquisitions   52,200  
Balance of intangible assets, Gross CDI Carrying Amount, End of period 93,297 93,297 $ 41,097
Aggregate amortization expense, Gross CDI Carrying Amount 10,798 5,254 1,329
Estimated Amortization Expense:      
Estimated Amortization Expense, 2020 9,352    
Estimated Amortization Expense, 2021 8,240    
Estimated Amortization Expense, 2022 7,126    
Estimated Amortization Expense, 2023 6,010    
Estimated Amortization Expense, Thereafter 12,258    
Balance of intangible assets, Accumulated Amortization, Beginning of period (39,513) (34,259)  
Balance of intangible assets, Accumulated Amortization, End of period (50,311) (39,513) (34,259)
Balance of intangible assets, Net CDI Amount, Beginning of period 53,784 6,838  
Balance of intangible assets, Net CDI Amount, End of period $ 42,986 $ 53,784 $ 6,838