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Loans and ACL - Summary of Amortized Cost of TLMs (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 3,372 | $ 9,102 |  | $ 3,801 | $ 50,989
Cash payments received |  |  |  |  | 4,500
Extended Maturity and Principal Forgiveness [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | 2,150 | 8,805 |  | 2,188 | 38,958
Commercial and Industrial [Member] | Extended Maturity and Principal Forgiveness [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 335 | $ 5,806 | $ 32,800 | $ 335 | $ 32,750

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