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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Goodwill not subject to amortization $ 2,018,848,000 $ 1,888,889,000
Core Deposit Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 137,929,000 105,165,000
Accumulated Amortization (105,662,000) (96,299,000)
Community Banking [Member]    
Finite-Lived Intangible Assets [Line Items]    
Goodwill not subject to amortization 2,018,848,000 1,888,889,000
Community Banking [Member] | Core Deposit Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 137,929,000 105,165,000
Accumulated Amortization $ (105,662,000) $ (96,299,000)