Loans - Schedule of Aging of Accruing Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 761,300	$ 737,790
Non-accrual	1,393	1,219
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	759,412	736,091
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,056	1,087
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	629	126
90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	203	486
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,888	1,699
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	149,391	144,376
Non-accrual	462	449
Commercial and Industrial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	149,362	144,274
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4	46
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	25	56
Commercial and Industrial [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	29	102
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	194,863	190,514
Non-accrual	501	501
Commercial Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	194,700	190,514
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	163
Commercial Real Estate [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	163
Commercial Lessors of Buildings [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	106,703	101,168
Non-accrual	2	3
Commercial Lessors of Buildings [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	106,703	101,168
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	70,198	64,262
Construction [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	70,175	64,262
Construction [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	23
Construction [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	23
Consumer Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	179,702	177,578
Non-accrual	242	80
Consumer Mortgage [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	178,805	176,403
Consumer Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	262	633
Consumer Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	432	56
Consumer Mortgage [Member] | 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	203	486
Consumer Mortgage [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	897	1,175
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	45,945	44,971
Non-accrual	69	71
Home Equity Line of Credit [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	45,250	44,595
Home Equity Line of Credit [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	695	376
Home Equity Line of Credit [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	695	376
Consumer Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	9,420	9,645
Non-accrual	44	48
Consumer Installment [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	9,411	9,637
Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8	5
Consumer Installment [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1	3
Consumer Installment [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	9	8
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	5,078	5,276
Non-accrual	73	67
Consumer Indirect [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	5,006	5,238
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	64	27
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8	11
Consumer Indirect [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 72	$ 38