Loans and ACL - Summary of Amortized Cost of Loans Designated as TLMs (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) Loan	Mar. 31, 2025 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	2	2
Amortized Cost \| $	$ 1,503	$ 2,165
Interest Forgiven [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost \| $	$ 0	$ 141
Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost \| $	$ 0	$ 2,024
Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	2	0
Amortized Cost \| $	$ 1,503	$ 0
Commercial and Industrial [Member] \| Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost \| $	$ 0	$ 2,024
% of Amortized Cost to Gross Loans by Category	0.00%	0.75%
Residential [Member] \| Interest Forgiven [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	0	1
Amortized Cost \| $	$ 0	$ 141
% of Amortized Cost to Gross Loans by Category	0.00%	0.02%
Residential [Member] \| Payment Deferral [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan	2	0
Amortized Cost \| $	$ 1,503	$ 0
% of Amortized Cost to Gross Loans by Category	0.24%	0.00%