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Goodwill and Core Deposit Intangible - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangibles $ 8,443,000 $ 9,685,000 $ 8,853,000
Impairment of core deposit and other intangibles 0 0 0
Amortization expense for year 2025 8,000,000.0    
Amortization expense for year 2026 7,800,000    
Amortization expense for year 2027 6,600,000    
Amortization expense for year 2028 4,200,000    
Amortization expense for year 2029 4,200,000    
Carrying amount of Company's goodwill 1,398,253,000 1,398,253,000 1,398,253,000
Impairment of goodwill $ 0 $ 0 $ 0