Allowance for Credit Losses on Loans - Schedule of Gross Charge-Offs by Origination (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Financing Receivable Recorded Investment [Line Items]
2025	$ 18	$ 42
2024	54	7
2023	6	18
2022	1	88
Prior	1	91
Revolving	16	96
Total	96	342
Real Estate - Residential [Member] \| Non-Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
2022	1
Total	1
Home Equity [Member] \| Non-Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Prior		89
Total		89
Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
2025	9	9
2023		16
2022		88
Revolving	11	10
Total	20	123
Consumer Loans [Member] \| Non-Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
2025	9	33
2024	54	7
2023	6	2
Prior	1	2
Revolving	5	86
Total	$ 75	$ 130

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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