Loans - Schedule of Aging of Past Due of Accruing and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 680,980	$ 626,958
Non-accrual	248	256
Total past due and non-accrual		824
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	679,634	626,134
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,252	300
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	82	268
90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	12
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,346
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	143,227	129,343
Non-accrual	17
Total past due and non-accrual		73
Commercial and Industrial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	143,026	129,270
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	184	70
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	17	3
Commercial and Industrial [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	201
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	188,910	231,785
Non-accrual	79	92
Total past due and non-accrual		92
Commercial Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	188,576	231,693
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	334
Commercial Real Estate [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	334
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		194,125
Non-accrual		99
Total past due and non-accrual		331
Residential Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		193,794
Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		95
Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		137
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		55,318
Total past due and non-accrual		32
Construction & Land Development [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		55,286
Construction & Land Development [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		32
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		16,387
Non-accrual		65
Total past due and non-accrual		296
Consumer [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		16,091
Consumer [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		103
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		$ 128
Commercial Lessors of Buildings [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	78,520
Commercial Lessors of Buildings [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	78,520
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	44,446
Construction [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	44,446
Consumer Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	167,419
Non-accrual	110
Consumer Mortgage [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	166,980
Consumer Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	394
Consumer Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	45
Consumer Mortgage [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	439
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	41,093
Home Equity Line of Credit [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	40,874
Home Equity Line of Credit [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	219
Home Equity Line of Credit [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	219
Consumer Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	11,197
Non-accrual	16
Consumer Installment [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	11,044
Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	121
Consumer Installment [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	20
Consumer Installment [Member] | 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	12
Consumer Installment [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	153
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	6,168
Non-accrual	26
Consumer Indirect [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 6,168