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Loans and ACL - Summary of Modified Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Jun. 30, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Amortized Cost of Modified Loans to Gross Loans by Category |  | 2.08% |
Modified term extension and forbearance financial effect |  | Forbearance agreements |
Modified term interest only financial effect |  | Interest-only payments for six months |
Modified term payment deferral financial effect |  | Payment Deferral 3-9 Months |
Total modified loan, amortized cost |  | $ 50,989 |
Loans modified amortized cost gross amount |  | 50,989 |
Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Modified term extension and forbearance amortized cost | $ 32,800 | $ 32,750 |
Modified term extension and forbearance amortized cost ofModified loans to gross loans by category |  | 6.14% |
Modified term interest only amortized cost of modified loans to gross loans by category |  | 0.34% |
Modified term payment defferal amortized cost of modified loans to gross loans by category |  | 0.66% |
Modifiedinterest only amortization cost |  | $ 2,982 |
Loans modified amortized cost gross amount |  | 38,800 |
Mortgage, Commercial [Member] | Real Estate [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Modified term extension and forbearance amortized cost |  | $ 6,208 |
Modified term extension and forbearance amortized cost ofModified loans to gross loans by category |  | 0.71% |
Modified term interest only amortized cost of modified loans to gross loans by category |  | 0.03% |
Modified term payment defferal amortized cost of modified loans to gross loans by category |  | 0.34% |
Modifiedinterest only amortization cost |  | $ 244 |
Loans modified amortized cost gross amount |  | 12,189 |
Current Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Total modified loan, amortized cost |  | 2,692 |
Current Loans [Member] | Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Total modified loan, amortized cost |  | 2,692 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Amortized cost of loans modified greater than 90 days past due and accruing status |  | 244 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Amortized cost of loans modified greater than 90 days past due and accruing status |  | 244 |
Nonaccrual [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loan modified amortized cost, nonaccrual |  | 48,053 |
Nonaccrual [Member] | Commercial and Industrial [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loan modified amortized cost, nonaccrual |  | 35,864 | $ 32,750
Nonaccrual [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loan modified amortized cost, nonaccrual |  | $ 12,189 |

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