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Loans (Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 20,754,813 | $ 18,824,251
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 6,109,532 | 5,967,182
Energy Production [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 903,654 | 681,568
Energy Service [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 203,629 | 194,126
Energy Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 21,612 | 61,043
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
Commercial mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 7,165,220 | 6,746,709
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 2,264,076 | 1,680,724
Commercial land loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 539,227 | 555,211
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 9,968,523 | 8,982,644
Home Equity Line of Credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 911,239 | 792,876
Home Equity Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 914,738 | 694,966
Home Improvement Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 852,536 | 765,887
Residential Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 259,456 | 38,923
Other consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 165,420 | 168,074
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
Real Estate Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | 13,071,912 | 11,443,370
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 444,474 | $ 476,962

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