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Loans and ACL - Summary of Amortized Cost of Collateral Dependent Loans (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | $ 74,141 | $ 96,905
Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 45,058 | 67,555
Real Estate [Member] | Construction, commercial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 1,839 | 6,309
Real Estate [Member] | Construction, Residential [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 0 | 2,303
Real Estate [Member] | Commercial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 19,448 | 13,401
Real Estate [Member] | Residential [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | $ 7,796 | $ 7,337

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