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Loans (Non-Accrual Loans, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | $ 78,866 | $ 60,907
Financing Receivable, Nonaccrual, No Allowance | 32,885 | 22,932
Commercial Portfolio Segment [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 46,004 | 19,545
Financing Receivable, Nonaccrual, No Allowance | 8,800 | 5,391
Commercial and Industrial Total Energy Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 4,079 | 11,500
Financing Receivable, Nonaccrual, No Allowance | 1,377 | 7,398
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 21,920 | 22,420
Financing Receivable, Nonaccrual, No Allowance | 18,660 | 4,983
Construction Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 0 | 0
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Total consumer real estate loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 6,511 | 7,442
Financing Receivable, Nonaccrual, No Allowance | 4,048 | 5,160
Consumer Loan [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 352 | 0
Financing Receivable, Nonaccrual, No Allowance | $ 0 | $ 0

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- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
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