Loans and ACL - Summary of Modified Loans (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Modified Term Extension Amortized Cost of Modified Loans to Gross Loans by Category	1.65%
Total modified loan units | Loan	3
Total modified loan, amortized cost	$ 40,652
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension loan units | Loan	1
Modified term extension amortization cost	$ 37,271
Modified Term Extension Amortized Cost of Modified Loans to Gross Loans by Category	6.53%
ModifiedTermExtension Financial Effect	13-month extension through January 2024
Commercial and Industrial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified Term Extension Amortized Cost of Modified Loans to Gross Loans by Category	0.39%
ModifiedTermExtension Financial Effect	Interest-only payments for six months
Mortgage, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified interest only loan units | Loan	2
Modifiedinterest only amortization cost	$ 3,381
Current Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total modified loan, amortized cost	40,631
Current Loans [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total modified loan, amortized cost	37,271
Current Loans [Member] | Mortgage, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total modified loan, amortized cost	$ 3,360