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Goodwill and Other Intangibles - Changes In Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 605,379 $ 605,379
Accumulated amortization 141,970 118,510
Net carrying amount 463,409 486,869
Core Deposit Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 481,294 481,294
Accumulated amortization 101,011 81,203
Net carrying amount 380,283 400,091
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 124,085 124,085
Accumulated amortization 40,959 37,307
Net carrying amount $ 83,126 $ 86,778