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Goodwill and Core Deposit Intangible - Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill      
Goodwill $ 1,398,253 $ 1,398,253 $ 1,398,253
Core Deposit Intangible      
Balance, beginning of period 48,770 58,455  
Amortization expense (8,443) (9,685) (8,853)
Balance, end of year $ 40,327 $ 48,770 $ 58,455