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Loans and ACL - Summary of Amortized Cost of Loans Designated as TLMs (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) Loan	Sep. 30, 2024 USD ($) Loan	Sep. 30, 2025 USD ($) Loan	Sep. 30, 2024 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	4	6	6	9
Amortized Cost | $	$ 523	$ 1,555	$ 2,602	$ 1,973
Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	1	0	1
Amortized Cost | $	$ 0	$ 229	$ 0	$ 229
Term Extension, Deferral and Interest Rate Reduction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	1	0	2
Amortized Cost | $	$ 0	$ 190	$ 0	$ 409
Interest Forgiven [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan			1	0
Amortized Cost | $			$ 139	$ 0
Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	4	3	5	4
Amortized Cost | $	$ 523	$ 632	$ 2,463	$ 670
Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	1	0	2
Amortized Cost | $	$ 0	$ 504	$ 0	$ 665
Commercial and Industrial [Member] | Term extension and Forbearance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	1	0	1
Amortized Cost | $	$ 0	$ 229	$ 0	$ 229
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%	0.06%	0.00%	0.06%
Commercial and Industrial [Member] | Term Extension, Deferral and Interest Rate Reduction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	1	0	2
Amortized Cost | $	$ 0	$ 190	$ 0	$ 409
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%	0.05%	0.00%	0.11%
Commercial and Industrial [Member] | Extended Maturity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	2	1	2
Amortized Cost | $	$ 0	$ 560	$ 1,940	$ 560
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%	0.15%	0.00%	0.15%
Commercial and Industrial [Member] | Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan			0	1
Amortized Cost | $			$ 0	$ 161
Amortized Cost of Modified Loans to Gross Loans by Category			0.00%	0.04%
Consumer Loans [Member] | Payment Deferral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	0
Amortized Cost | $	$ 0	$ 0
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%	0.00%
Commercial [Member] | Extended Maturity [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	3	0	3	1
Amortized Cost | $	$ 472	$ 0	$ 472	$ 38
Amortized Cost of Modified Loans to Gross Loans by Category	0.06%	0.00%	0.06%	0.00%
Residential [Member] | Interest Forgiven [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan			1	0
Amortized Cost | $			$ 139	$ 0
Amortized Cost of Modified Loans to Gross Loans by Category			0.02%	0.00%
Residential [Member] | Extended Maturity [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	1	1	1	1
Amortized Cost | $	$ 51	$ 72	$ 51	$ 72
Amortized Cost of Modified Loans to Gross Loans by Category	0.01%	0.01%	0.01%	0.01%
Residential [Member] | Payment Deferral [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and deferral loan units | Loan	0	1	0	1
Amortized Cost | $	$ 0	$ 504	$ 0	$ 504
Amortized Cost of Modified Loans to Gross Loans by Category	0.00%	0.07%	0.00%	0.07%

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