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Business - Additional Information (Detail)
$ in Thousands
Mar. 31, 2022
USD ($)
Subsidiary
Location
Jan. 07, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule Of Description Of Company [Line Items]      
Number of inactive subsidiaries | Subsidiary 1    
Bank operated banking centers | Location 65    
Bank operated trust office locations, number | Location 3    
Total assets $ 17,539,137   $ 15,883,697
Bank owned life insurance (BOLI) 259,254   251,570
Goodwill 765,822   $ 663,707
Suncrest Bank [Member]      
Schedule Of Description Of Company [Line Items]      
Total assets   $ 1,380,000  
Acquired net loans at fair value 765,900 765,900  
Bank owned life insurance (BOLI) 9,000 9,000  
Goodwill 102,100    
Deposit premium 3,900    
Cash consideration 39,600 39,600  
Fair value of acquired investment securities $ 131,100 $ 131,100