Loans - Schedule of Aging of Accruing Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 852,692	$ 829,859
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	851,959	828,610
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	318	718
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	64	531
90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	351
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	733	1,249
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	157,968	152,657
Commercial and Industrial [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	157,968	152,589
Commercial and Industrial [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		48
Commercial and Industrial [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		20
Commercial and Industrial [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		68
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	256,019	255,911
Commercial Real Estate [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	256,019	255,835
Commercial Real Estate [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		76
Commercial Real Estate [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		76
Commercial Lessors of Buildings [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	121,711	114,010
Commercial Lessors of Buildings [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	121,711	114,010
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	50,370	47,982
Construction [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	50,351	47,962
Construction [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	19	20
Construction [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	19	20
Consumer Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	197,436	193,298
Consumer Mortgage [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	197,010	192,673
Consumer Mortgage [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	18	223
Consumer Mortgage [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	57	402
Consumer Mortgage [Member] \| 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	351
Consumer Mortgage [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	426	625
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	54,815	52,616
Home Equity Line of Credit [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	54,563	52,221
Home Equity Line of Credit [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	252	320
Home Equity Line of Credit [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		75
Home Equity Line of Credit [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	252	395
Consumer Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	10,185	9,019
Consumer Installment [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	10,166	9,002
Consumer Installment [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	12	17
Consumer Installment [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	7
Consumer Installment [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	19	17
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,188	4,366
Consumer Indirect [Member] \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,171	4,318
Consumer Indirect [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	17	14
Consumer Indirect [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		34
Consumer Indirect [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 17	$ 48