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Goodwill and Other Amortizing Intangible Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill And Other Intangibles [Line Items]        
Goodwill   $ 363,715,000 $ 303,328,000  
Impairment charges on goodwill   0 0 $ 0
Servicing Asset   4,100,000 3,000,000  
Total amortization   22,796,000 18,671,000  
Intangible amortization   4,983,000 3,196,000 3,497,000
Servicing Asset at Amortized Cost, Amortization   $ 900,000 700,000 600,000
Goodwill, Acquired During Period $ 60,387,000      
Customer deposit intangibles        
Goodwill And Other Intangibles [Line Items]        
Core deposits remaining amortization period   6 years 6 months    
Core deposits weighted average amortization period   6 years 1 month 6 days    
Total amortization   $ 20,747,000 16,750,000  
Customer list intangible        
Goodwill And Other Intangibles [Line Items]        
Core deposits remaining amortization period   5 years 8 months 12 days    
Core deposits weighted average amortization period   4 years    
Total amortization   $ 2,049,000 1,921,000  
Customer-Related Intangible Assets [Member]        
Goodwill And Other Intangibles [Line Items]        
Intangible amortization   $ 4,100,000 $ 2,500,000 $ 2,900,000