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Loans and Allowance for Credit Losses - Summary of Amortized Cost of Nonaccrual Loans with No Related Allowance (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | $ 131,965 | $ 19,282
Amortized Cost of Nonaccrual Loans with no related Allowance | 62,453 | 19,282
Commercial and Industrial Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 33,610 | 4,423
Amortized Cost of Nonaccrual Loans with no related Allowance | 14,793 | 4,423
Commercial Real Estate Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 69,859 | 805
Amortized Cost of Nonaccrual Loans with no related Allowance | 19,164 | 805
Consumer Real Estate Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 24,633 | 13,614
Amortized Cost of Nonaccrual Loans with no related Allowance | 24,633 | 13,614
Consumer Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 828 | 40
Amortized Cost of Nonaccrual Loans with no related Allowance | 828 | 40
Credit Cards Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 3,035 | 400
Amortized Cost of Nonaccrual Loans with no related Allowance | 3,035 | 400
Leases and Other Portfolio [Member] |  |
Financing Receivable Nonaccrual Status [Line Items] |  |
Nonaccrual Loans | 0 | 0
Amortized Cost of Nonaccrual Loans with no related Allowance | $ 0 | $ 0

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