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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2025
USD ($)
Region
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number Of Metropolitan Statistical Areas | Region 5    
Loan fees net of costs amortized and included in interest income $ 64,392,000 $ 36,937,000 $ 39,509,000
Minimum days, related to accrual of interest on discontinued commercial and consumer loans 90 days    
Maximum days, related to accrual of interest on discontinued commercial and consumer loans 120 days    
Real estate acquired in foreclosure or other settlement of loans $ 8,857,000,000 327,000,000  
Recorded investment of consumer mortgage loans 1,868,000,000 795,000,000  
Advertising Expense 9,003,000 8,336,000 9,330,000
Amortization expense on intangible assets 9,363,000 3,639,000 5,116,000
Total goodwill 2,018,848,000 1,888,889,000  
Stock based compensation expense $ 13,089,000 $ 12,130,000 $ 12,463,000
Antidilutive stock options and restricted stock outstanding shares | shares 563,090 590,395 1,410,389
Allowances for credit losses on securities held to maturity $ 16,000 $ 18,000  
Allowance for credit losses on securities held for sale 0 0  
Restricted Stock Units (RSUs) [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Stock based compensation expense $ 13,089,000 $ 12,130,000 $ 12,463,000
Minimum [Member] | Core Deposit Intangible Assets [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Intangible assets amortization period 1 year    
Maximum [Member] | Core Deposit Intangible Assets [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Intangible assets amortization period 10 years    
Furniture, Fixtures and Equipment [Member] | Minimum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Bank premises and equipment, useful life 3 years    
Furniture, Fixtures and Equipment [Member] | Maximum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Bank premises and equipment, useful life 15 years    
Buildings and Improvements [Member] | Minimum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Bank premises and equipment, useful life 5 years    
Buildings and Improvements [Member] | Maximum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Bank premises and equipment, useful life 40 years