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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | $ 21,254,495 | $ 20,754,813
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 48,937 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 6,069,215 | 6,109,532
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 7,542 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 1,315,227 | 1,128,895
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 0 |
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 8,018,049 | 7,704,447
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 36,439 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 2,075,700 | 2,264,076
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 | 3,339,275 | 3,103,389
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 4,387 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 437,029 | $ 444,474
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing | 569 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 62,310 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 26,553 |
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 | 1,104 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 10,791 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 0 |
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 | 19,316 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 4,546 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 86,779 |
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 | 27,532 |
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 | 4,020 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 44,129 |
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 | 10,336 |
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 | 762 |
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 149,089 |
Financial Asset, Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 54,085 |
Financial Asset, Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 5,124 |
Financial Asset, Past Due | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 54,920 |
Financial Asset, Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 0 |
Financial Asset, Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 29,652 |
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 5,308 |
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 21,105,406 |
Financial Asset, Not Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 6,015,130 |
Financial Asset, Not Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 1,310,103 |
Financial Asset, Not Past Due | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 7,963,129 |
Financial Asset, Not Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 2,075,700 |
Financial Asset, Not Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | 3,309,623 |
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, net of unearned discounts | $ 431,721 |

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