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Goodwill and Core Deposits and Other Intangibles - Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Goodwill            
Goodwill $ 1,398,253   $ 1,398,253 $ 1,398,253   $ 1,398,253
Core Deposit Intangibles            
Balance, beginning of period     40,327 44,490 $ 48,770  
Amortization expense (2,025) $ (2,140) (4,072) (4,163) (4,280)  
Balance, end of year $ 36,255 $ 44,490 $ 36,255 $ 40,327 $ 44,490