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Loans (Investment in Loans Related to Allowance for Loan Loss by Portfolio Segment Disaggregated Based on Impairment Methodology) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 18,824,251 | $ 17,154,969
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 5,959,133 | 5,674,798
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 935,265 | 925,729
Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 9,521 | 34,852
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 7,301,920 | 6,706,078
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,680,724 | 1,477,247
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,460,726 | 1,843,539
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 476,962 | 492,726
Specific Valuation Allowances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 8,526 | 12,181
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 2,435 | 6,082
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 2,700 | 4,383
Specific Valuation Allowances [Member] | Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 0 | 0
Specific Valuation Allowances [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 2,650 | 1,716
Specific Valuation Allowances [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 0 | 0
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 741 | 0
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Portion of allowance for loan losses | 0 | 0
Loans Individually Evaluated for Impairment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 58,631 | 52,576
Loans Individually Evaluated for Impairment [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 18,670 | 18,980
Loans Individually Evaluated for Impairment [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 11,353 | 15,058
Loans Individually Evaluated for Impairment [Member] | Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 0 | 0
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 21,373 | 17,711
Loans Individually Evaluated for Impairment [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 0 | 0
Loans Individually Evaluated for Impairment [Member] | Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 7,235 | 827
Loans Individually Evaluated for Impairment [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 0 | $ 0

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