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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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