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Loans (Investment in Loans Related to Allowance for Loan Loss by Portfolio Segment Disaggregated Based on Impairment Methodology) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts $ 20,754,813 $ 18,824,251    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 270,151 245,996    
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 6,109,532 5,967,182    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 87,569 74,006 $ 104,237 $ 72,091
Commercial and Industrial Total Energy Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 1,128,895 936,737    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 9,992 17,814 18,062 17,217
Commercial Real Estate, Buildings, Land and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 7,704,447 7,301,920    
Construction Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 2,264,076 1,680,724    
Total consumer real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 3,103,389 2,460,726    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 19,106 13,538 8,004 6,585
Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 444,474 476,962    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 10,279 10,040 $ 7,017 $ 7,837
Specific Valuation Allowances [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 17,521 8,526    
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 13,265 2,435    
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2,700 2,700    
Specific Valuation Allowances [Member] | Commercial Real Estate, Buildings, Land and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 122 2,650    
Specific Valuation Allowances [Member] | Construction Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 503 0    
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 766 741    
Specific Valuation Allowances [Member] | Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 165 0    
Loans Individually Evaluated for Impairment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 76,287 58,631    
Loans Individually Evaluated for Impairment [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 45,009 18,670    
Loans Individually Evaluated for Impairment [Member] | Commercial and Industrial Total Energy Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 4,078 11,353    
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate, Buildings, Land and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 18,797 21,373    
Loans Individually Evaluated for Impairment [Member] | Construction Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 2,012 0    
Loans Individually Evaluated for Impairment [Member] | Total consumer real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts 6,039 7,235    
Loans Individually Evaluated for Impairment [Member] | Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned discounts $ 352 $ 0