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Goodwill and Core Deposits and Other Intangibles - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]            
Core deposit and other intangible amortization $ 2,095 $ 2,253 $ 2,477 $ 6,375 $ 7,432  
Amortization expense for this year 8,400     8,400    
Amortization expense for year 1 8,000     8,000    
Amortization expense for year 2 7,800     7,800    
Amortization expense for year 3 6,600     6,600    
Amortization expense for year 4 4,200     4,200    
Carrying amount of Company's goodwill $ 1,398,253 $ 1,398,253   $ 1,398,253   $ 1,398,253