Loans - Schedule of Aging of Past Due of Accruing and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 647,626	$ 626,958
Non-accrual	218	256
Total past due and non-accrual		824
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	646,975	626,134
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		300
30-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	564
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		268
61 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	87
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	651
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	137,369
Non-accrual	2
Commercial and Industrial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	137,318
Commercial and Industrial [Member] | 30-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	51
Commercial and Industrial [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	51
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		129,343
Total past due and non-accrual		73
Commercial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		129,270
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		70
Commercial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		3
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	167,878	231,785
Non-accrual	87	92
Total past due and non-accrual		92
Commercial Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	167,878	231,693
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	81,917
Commercial Lessors of Buildings [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	81,917
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	43,498
Construction [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	43,467
Construction [Member] | 30-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	31
Construction [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	31
Consumer Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	157,316
Non-accrual	73
Consumer Mortgage [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	157,079
Consumer Mortgage [Member] | 30-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	237
Consumer Mortgage [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	237
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	43,323
Home Equity Line of Credit [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	43,074
Home Equity Line of Credit [Member] | 30-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	162
Home Equity Line of Credit [Member] | 61 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	87
Home Equity Line of Credit [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	249
Consumer Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	9,951
Non-accrual	56
Consumer Installment [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	9,868
Consumer Installment [Member] | 30-60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	83
Consumer Installment [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	83
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	6,374
Consumer Indirect [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 6,374