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Premises and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]      
Depreciation and amortization expense charged $ 13,000 $ 13,400 $ 14,100
Weighted-average lease term 16 years    
Operating lease ROU assets $ 38,800 $ 43,100  
Operating lease ROU assets statement of financial position extensible list Premises and equipment, net Premises and equipment, net  
Operating lease ROU liabilities $ 42,957 $ 47,500  
Operating Lease Liability Statement Of Financial Position Extensible List Other liabilities Other liabilities  
Operating lease, expense $ 4,600 $ 5,200 5,800
Weighted average discount rate 2.92%    
Weighted-average finance lease term 20 years    
Finance lease ROU assets $ 9,200 $ 4,100  
Finance lease ROU assets statement of financial position extensible list Premises and equipment, net Premises and equipment, net  
Finance lease ROU liabilities $ 9,755 $ 4,800  
Finance lease ROU liabilities statement of financial position extensible list Other liabilities Other liabilities  
Weighted average finance lease discount rate 3.42% 3.78%  
Amortization cost related to finance lease ROU assets $ 500 $ 400 400
Interest expense related to finance lease ROU assets $ 200 $ 200 $ 200
Maximum [Member]      
Property Plant And Equipment [Line Items]      
Operating lease terms 30 years    
Operating lease term extensions 10 years    
Finance lease terms 25 years    
Finance lease term extensions 10 years    
Minimum [Member]      
Property Plant And Equipment [Line Items]      
Operating lease terms 1 year    
Operating lease term extensions 5 years    
Annual obligation $ 10,700    
Finance lease terms 5 years    
Finance lease term extensions 5 years