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		1.91%
Total modified loan, amortized cost		$ 46,876
Loans modified amortized cost gross amount		46,876
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and forbearance amortized cost	$ 37,300	$ 37,250
Modified term extension and forbearance amortized cost ofModified loans to gross loans by category		6.82%
Loans modified amortized cost gross amount		$ 37,250
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		46,876
Nonaccrual [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loan modified amortized cost, nonaccrual		37,250
Nonaccrual [Member] | Mortgage, Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loan modified amortized cost, nonaccrual		$ 9,626