Loans - Schedule of Aging of Accruing Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 719,727	$ 701,481
Non-accrual	3,108	396
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	718,589	700,356
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	430	528
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	444	597
90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	264
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,138	1,125
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	134,125	152,125
Non-accrual	2,116	59
Commercial and Industrial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	134,075	151,964
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	50	111
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		50
Commercial and Industrial [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	50	161
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	194,329	190,702
Non-accrual	679	62
Commercial Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	194,329	190,702
Commercial Lessors of Buildings [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	98,049	82,687
Non-accrual	4	15
Commercial Lessors of Buildings [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	98,049	82,687
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	57,283	49,214
Construction [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	57,283	49,214
Consumer Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	175,093	166,891
Non-accrual	115	172
Consumer Mortgage [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	174,143	166,411
Consumer Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	246	307
Consumer Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	440	173
Consumer Mortgage [Member] | 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	264
Consumer Mortgage [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	950	480
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	44,978	43,269
Non-accrual	72
Home Equity Line of Credit [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	44,897	42,955
Home Equity Line of Credit [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	81	33
Home Equity Line of Credit [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		281
Home Equity Line of Credit [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	81	314
Consumer Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	10,377	10,636
Non-accrual	44	49
Consumer Installment [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	10,345	10,602
Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	28	25
Consumer Installment [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4	9
Consumer Installment [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	32	34
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	5,493	5,957
Non-accrual	78	39
Consumer Indirect [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	5,468	5,821
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	25	52
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		84
Consumer Indirect [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 25	$ 136