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Loans (Age Analysis of Past Due Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | $ 20,754,813 | $ 18,824,251
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 15,711 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 6,109,532 | 5,967,182
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 7,685 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 1,128,895 | 936,737
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 0 |
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 7,704,447 | 7,301,920
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 1,523 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 2,264,076 | 1,680,724
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 0 |
Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 3,103,389 | 2,460,726
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 5,681 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 444,474 | 476,962
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 822 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 103,496 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 37,130 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 4,263 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 37,525 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 870 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 17,015 | 12,504
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 6,693 | 6,495
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 58,089 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 28,120 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 4,079 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 13,040 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 12,028 | 7,716
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 822 | 251
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 161,585 |
Financial Asset, Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 65,250 |
Financial Asset, Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 8,342 |
Financial Asset, Past Due | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 50,565 |
Financial Asset, Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 870 |
Financial Asset, Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 29,043 | 20,220
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 7,515 | 6,746
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 20,593,228 |
Financial Asset, Not Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 6,044,282 |
Financial Asset, Not Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 1,120,553 |
Financial Asset, Not Past Due | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 7,653,882 |
Financial Asset, Not Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 2,263,206 |
Financial Asset, Not Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 3,074,346 | 2,440,506
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | $ 436,959 | $ 470,216

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