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Loans and ACL - Summary of financial effects of TLMs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Commercial And Industrial [Member] | Extended Maturity [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Term Extension | 20 months | 76 months | 20 months | 65 months
Commercial And Industrial [Member] | Interest Rate Below Market Reduction [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Interest Rate Reduction | 0.00% | 12.24% | 0.00% | 11.28%
Commercial And Industrial [Member] | Payment Deferral [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount | $ 0 | $ 6 | $ 0 | $ 10
Commercial And Industrial [Member] | Interest Forgiveness [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount | $ 0 | $ 0 | $ 0 | $ 0
Consumer Loans [Member] | Interest Rate Below Market Reduction [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Interest Rate Reduction |  | 0.00% |  | 0.00%
Consumer Loans [Member] | Payment Deferral [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount |  | $ 1 |  | $ 1
Consumer Loans [Member] | Interest Forgiveness [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount |  | $ 0 |  | $ 0
Real Estate Loan [Member] | Commercial [Member] | Extended Maturity [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Term Extension | 13 months |  | 13 months | 84 months
Real Estate Loan [Member] | Commercial [Member] | Interest Rate Below Market Reduction [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Interest Rate Reduction | 0.00% |  | 0.00% | 0.00%
Real Estate Loan [Member] | Commercial [Member] | Payment Deferral [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount | $ 0 |  | $ 0 | $ 0
Real Estate Loan [Member] | Commercial [Member] | Interest Forgiveness [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount | $ 0 |  | $ 0 | $ 0
Real Estate Loan [Member] | Residential [Member] | Extended Maturity [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Term Extension | 15 months | 84 months | 15 months | 84 months
Real Estate Loan [Member] | Residential [Member] | Interest Rate Below Market Reduction [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted Average Interest Rate Reduction | 0.00% | 0.00% | 0.00% | 0.00%
Real Estate Loan [Member] | Residential [Member] | Payment Deferral [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount | $ 0 | $ 162 | $ 0 | $ 162
Real Estate Loan [Member] | Residential [Member] | Interest Forgiveness [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Weighted average payment amount | $ 0 | $ 0 | $ 45 | $ 0

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