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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill      
Balance, beginning of period $ 1,398,253 $ 973,025  
Acquisitions 0 425,228  
Balance, end of period 1,398,253 1,398,253 $ 973,025
Core Deposit Intangible      
Balance, beginning of period 58,455 25,045  
Acquisitions 0 42,263  
Amortization expense (9,685) (8,853) (5,683)
Balance, end of year $ 48,770 $ 58,455 $ 25,045