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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