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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