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Loans and ACL - Summary of Modified Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |
Amortized Cost of Modified Loans to Gross Loans by Category |  | 1.73%
Total modified loan, amortized cost |  | $ 42,376
Loans modified amortized cost gross amount |  | 42,376
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 |  | 6.05%
Loans modified amortized cost gross amount |  | $ 32,750
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Modified term extension and forbearance amortized cost |  | $ 6,288
Modified term extension and forbearance amortized cost ofModified loans to gross loans by category |  | 0.71%
Modified term extension and interest only amortization cost |  | $ 287
Modified term extension and interest only amortized cos of modified loans to gross loans by category |  | 0.03%
Modified term extension and forbearance financial effect |  | Forbearance agreements
Modified term interest only amortized cost of modified loans to gross loans by category |  | 0.35%
Modified term interest only financial effect |  | Interest-only payments for six months
Modified term extension and interest only financial effect |  | Term extension and interest-only payments for six months
Modifiedinterest only amortization cost |  | $ 3,051
Loans modified amortized cost gross amount |  | 9,626
Current Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total modified loan, amortized cost |  | 0
Current Loans [Member] | Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total modified loan, amortized cost |  | 0
Nonaccrual [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loan modified amortized cost, nonaccrual |  | 42,376
Nonaccrual [Member] | Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loan modified amortized cost, nonaccrual |  | 32,750
Nonaccrual [Member] | Mortgage, Commercial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loan modified amortized cost, nonaccrual |  | $ 9,626

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