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Loans and ACL - Summary of Amortized Cost of Collateral-Dependent Loans, Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | $ 59,238 | $ 79,419
Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 20,145 | 42,723
Real Estate [Member] | Construction, Commercial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 0 | 116
Real Estate [Member] | Commercial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | 32,879 | 26,994
Real Estate [Member] | Residential [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized cost of collateral dependent loans | $ 6,214 | $ 9,586

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