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Business - Additional Information (Detail)
$ in Thousands
Sep. 30, 2022
USD ($)
Subsidiary
Center
Location
Jan. 07, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule Of Description Of Company [Line Items]      
Number of inactive subsidiaries | Subsidiary 1    
Bank operated banking centers | Center 63    
Bank operated trust office locations, number | Location 4    
Assets $ 16,349,276   $ 15,883,697
Bank Owned Life Insurance 256,850   251,570
Goodwill 765,822   $ 663,707
Suncrest Bank [Member]      
Schedule Of Description Of Company [Line Items]      
Assets   $ 1,380,000  
Acquired net loans at fair value 765,900 765,900  
Fair Value of Acquired Investment Securities 131,100 131,100  
Bank Owned Life Insurance 9,000 9,000  
Goodwill 102,100 102,100  
Deposits Assets 3,900 3,900  
Cash consideration $ 39,600 $ 39,600