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Goodwill and Other Intangibles - Changes In Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 604,506 $ 89,145
Accumulated amortization 93,056 25,498
Net carrying amount 511,450 63,647
Core Deposit Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 481,294 2,345
Accumulated amortization 59,391 1,600
Net carrying amount 421,903 745
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 123,212 86,800
Accumulated amortization 33,665 23,898
Net carrying amount $ 89,547 $ 62,902