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Loans - Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | $ 21,254,495 |  | $ 20,754,813 |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 277,803 |  | 270,151 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 6,069,215 |  | 6,109,532 |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 95,484 | $ 94,307 | 87,569 | $ 78,554 | $ 75,596 | $ 74,006
Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 1,315,227 |  | 1,128,895 |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 10,389 | 10,256 | 9,992 | 11,485 | 14,218 | 17,814
Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 8,018,049 |  | 7,704,447 |  |  |
Construction Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 2,075,700 |  | 2,264,076 |  |  |
Total consumer real estate loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 3,339,275 |  | 3,103,389 |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 21,707 | 18,924 | 19,106 | 15,707 | 13,857 | 13,538
Consumer Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 437,029 |  | 444,474 |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 9,300 | $ 8,824 | 10,279 | $ 10,541 | $ 8,402 | $ 10,040
Specific Valuation Allowances [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 19,939 |  | 17,521 |  |  |
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 | 15,343 |  | 13,265 |  |  |
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 | 2,677 |  | 2,700 |  |  |
Specific Valuation Allowances [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 1,235 |  | 122 |  |  |
Specific Valuation Allowances [Member] | Construction Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 503 |  |  |
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 | 684 |  | 766 |  |  |
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 165 |  |  |
Loans Individually Evaluated for Impairment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 59,906 |  | 76,287 |  |  |
Loans Individually Evaluated for Impairment [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 36,745 |  | 45,009 |  |  |
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 | 4,020 |  | 4,078 |  |  |
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 13,322 |  | 18,797 |  |  |
Loans Individually Evaluated for Impairment [Member] | Construction Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | 0 |  | 2,012 |  |  |
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 | 5,819 |  | 6,039 |  |  |
Loans Individually Evaluated for Impairment [Member] | Consumer Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned discounts | $ 0 |  | $ 352 |  |  |

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