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Goodwill and Other Intangible Assets - Summary of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance of intangible assets, Gross CDI Carrying Amount, Beginning of period $ 93,297 $ 93,297
Balance of intangible assets, Gross CDI Carrying Amount, End of period 93,297 93,297
Estimated Amortization Expense:    
Estimated Amortization Expense, 2021 8,240  
Estimated Amortization Expense, 2022 7,126  
Estimated Amortization Expense, 2023 6,010  
Estimated Amortization Expense, 2024 4,892  
Estimated Amortization Expense, 2025 3,773  
Estimated Amortization Expense, Thereafter 3,593  
Total 33,634 42,986
Balance of intangible assets, Accumulated Amortization, Beginning of period (50,311) (39,513)
Amortization (9,352) (10,798)
Balance of intangible assets, Accumulated Amortization, End of period (59,663) (50,311)
Balance of intangible assets, Net CDI Amount, Beginning of period 42,986 53,784
Amortization (9,352) (10,798)
Balance of intangible assets, Net CDI Amount, End of period $ 33,634 $ 42,986