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Loans - Non-Accrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | $ 62,393 | $ 78,866
Financing Receivable, Nonaccrual, No Allowance | 25,369 | 32,885
Commercial Portfolio Segment [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 38,015 | 46,004
Financing Receivable, Nonaccrual, No Allowance | 10,614 | 8,800
Commercial and Industrial Total Energy Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 4,020 | 4,079
Financing Receivable, Nonaccrual, No Allowance | 1,343 | 1,377
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 14,058 | 21,920
Financing Receivable, Nonaccrual, No Allowance | 9,267 | 18,660
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 | 6,107 | 6,511
Financing Receivable, Nonaccrual, No Allowance | 3,952 | 4,048
Consumer Loan [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Financing Receivable, Nonaccrual | 193 | 352
Financing Receivable, Nonaccrual, No Allowance | $ 193 | $ 0

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