Loans and ACL - Summary of Amortized Cost of Loans Designated as TLMs (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Loan	Jun. 30, 2024 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			2	1
Recorded Investment \| $	$ 0	$ 0	$ 2,165	$ 225
Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			1	0
Recorded Investment \| $			$ 2,024	$ 0
Term Extension and Interest Rate Reduction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			0	1
Recorded Investment \| $			$ 0	$ 225
Interest Forgiveness [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			1	0
Recorded Investment \| $			$ 141	$ 0
Commercial and Industrial [Member] \| Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			1	0
Recorded Investment \| $			$ 2,024	$ 0
Recorded Investment of Modified Loans to Gross Loans by Category			0.62%	0.00%
Commercial and Industrial [Member] \| Term Extension and Interest Rate Reduction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			0	1
Recorded Investment \| $			$ 0	$ 225
Recorded Investment of Modified Loans to Gross Loans by Category				0.06%
Residential [Member] \| Interest Forgiveness [Member] \| Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units \| Loan			1	0
Recorded Investment \| $			$ 141	$ 0
Recorded Investment of Modified Loans to Gross Loans by Category			0.02%	0.00%