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Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Identifiable liabilities:    
Resulting goodwill $ 2,018,848,000 $ 1,888,889,000
UBSI Piedmont Bancorp [Member]    
Purchase price:    
Value of common shares issued 280,946,000  
Cash for fractional shares 21,000  
Total purchase price 280,967,000  
Identifiable assets:    
Cash and cash equivalents 77,497,000  
Investment securities 94,426,000  
Net loans and leases 1,998,350,000  
Premises and equipment 23,816,000  
Operating lease right-of-use asset 5,124,000  
BOLI 40,801,000  
Core deposit intangible 32,764,000  
Other assets 30,573,000  
Total identifiable assets 2,303,351,000  
Identifiable liabilities:    
Deposits 2,105,810,000  
Long-term borrowings 20,000,000  
Operating lease liability 5,744,000  
Other liabilities 20,789,000  
Total identifiable liabilities 2,152,343,000  
Fair value of net assets acquired including identifiable intangible assets 151,008,000  
Resulting goodwill $ 129,959,000