Allowance for Credit Losses on Loans - Summary of Activity Related to Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	$ 6,399	$ 6,065	$ 6,420	$ 5,824
Provision for (recovery of) credit losses	(405)	242	(487)	530
Charge-offs	(62)	(103)	(96)	(191)
Recoveries	54	27	149	68
Net (charge-offs) recoveries	(8)	(76)	53	(123)
Balance, end of period	5,986	6,231	5,986	6,231
Commercial [Member] \| Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	1,449	1,699	1,479	1,528
Provision for (recovery of) credit losses	(146)	(284)	(241)	(130)
Charge-offs	(10)	(97)	(20)	(113)
Recoveries	25	15	100	48
Net (charge-offs) recoveries	15	(82)	80	(65)
Balance, end of period	1,318	1,333	1,318	1,333
Real Estate Commercial [Member] \| Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	2,405	2,324	2,420	2,266
Provision for (recovery of) credit losses	(38)	37	(53)	95
Balance, end of period	2,367	2,361	2,367	2,361
Other Real Estate Construction [Member] \| Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	493	340	487	412
Provision for (recovery of) credit losses	(14)	69	(8)	(3)
Balance, end of period	479	409	479	409
Other Loans [Member] \| Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	14	20	15	18
Provision for (recovery of) credit losses	5	(5)	4	(3)
Balance, end of period	19	15	19	15
Real Estate 1 - 4 Family Construction [Member] \| Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	87	57	83	56
Provision for (recovery of) credit losses	(18)	42	(14)	43
Balance, end of period	69	99	69	99
Real Estate - Residential [Member] \| Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	1,115	809	1,155	781
Provision for (recovery of) credit losses	(176)	455	(217)	482
Charge-offs	(1)		(1)
Recoveries			1	1
Net (charge-offs) recoveries	(1)		0	1
Balance, end of period	938	1,264	938	1,264
Home Equity [Member] \| Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	700	652	687	588
Provision for (recovery of) credit losses	(24)	(2)	(14)	62
Recoveries	4	1	7	1
Net (charge-offs) recoveries	4	1	7	1
Balance, end of period	680	651	680	651
Consumers Loans [Member] \| Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of period	136	164	94	175
Provision for (recovery of) credit losses	6	(70)	56	(16)
Charge-offs	(51)	(6)	(75)	(78)
Recoveries	25	11	41	18
Net (charge-offs) recoveries	(26)	5	(34)	(60)
Balance, end of period	$ 116	$ 99	$ 116	$ 99

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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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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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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