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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 |  |

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