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Loans (Age Analysis of Past Due Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 18,824,251 | $ 17,154,969
Accruing Loans 90 or More Days Past Due | 15,033 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,959,133 | 5,674,798
Accruing Loans 90 or More Days Past Due | 5,503 |
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 935,265 | 925,729
Accruing Loans 90 or More Days Past Due | 1,146 |
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9,521 | 34,852
Accruing Loans 90 or More Days Past Due | 1,954 |
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 7,301,920 | 6,706,078
Accruing Loans 90 or More Days Past Due | 92 |
Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,680,724 | 1,477,247
Accruing Loans 90 or More Days Past Due | 3,498 |
Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2,460,726 | 1,843,539
Accruing Loans 90 or More Days Past Due | 2,589 |
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 476,962 | 492,726
Accruing Loans 90 or More Days Past Due | 251 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 78,100 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 27,551 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,387 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 61 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 20,224 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,878 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 12,504 | 7,856
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,495 | 5,155
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 43,505 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 21,705 |
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] |  |
Financing Receivable, before Allowance for Credit Loss | 6,771 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,954 |
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] |  |
Financing Receivable, before Allowance for Credit Loss | 1,610 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,498 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,716 | 2,690
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 251 | 311
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 121,605 |
Financial Asset, Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 49,256 |
Financial Asset, Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 13,158 |
Financial Asset, Past Due | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,015 |
Financial Asset, Past Due | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 21,834 |
Financial Asset, Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,376 |
Financial Asset, Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 20,220 | 10,546
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,746 | 5,466
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 18,702,646 |
Financial Asset, Not Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,909,877 |
Financial Asset, Not Past Due | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 922,107 |
Financial Asset, Not Past Due | Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,506 |
Financial Asset, Not Past Due | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,280,086 |
Financial Asset, Not Past Due | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,672,348 |
Financial Asset, Not Past Due | Total consumer real estate loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,440,506 | 1,832,993
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 470,216 | $ 487,260

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