Summary of Significant Accounting Policies - Summary of Category of Loans and Impact of Change from Adoption (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	$ 647,626		$ 626,958
Deferred loan costs, net	147		213
Allowance for credit/loan losses	(6,307)		(6,838)	$ (7,305)	$ (7,618)
Net Total Loans	641,466		620,333
ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		$ 626,958
Deferred loan costs, net		213
Allowance for credit/loan losses		(6,279)
Net Total Loans		620,892
Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			626,958
Deferred loan costs, net			213
Allowance for credit/loan losses		(6,838)	(6,838)
Net Total Loans			620,333
Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit/loan losses		559	(559)
Net Total Loans			559
Commercial and Industrial [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	137,369
Allowance for credit/loan losses	(1,821)		(1,110)
Commercial and Industrial [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		127,134
Allowance for credit/loan losses		(1,768)
Commercial and Industrial [Member] | Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			129,343
Allowance for credit/loan losses		(1,110)
Commercial and Industrial [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			(2,209)
Allowance for credit/loan losses		(658)
Commercial Real Estate [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	167,878		231,785
Allowance for credit/loan losses	(2,236)		(2,760)	$ (2,550)	$ (2,838)
Commercial Real Estate [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		161,160
Allowance for credit/loan losses		(2,219)
Commercial Real Estate [Member] | Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			231,785
Allowance for credit/loan losses		(2,760)
Commercial Real Estate [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			(70,625)
Allowance for credit/loan losses		541
Commercial Lessors of Buildings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	81,917
Allowance for credit/loan losses	(965)
Commercial Lessors of Buildings [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		83,728
Allowance for credit/loan losses		(974)
Commercial Lessors of Buildings [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			83,728
Allowance for credit/loan losses		(974)
Construction [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	43,498
Allowance for credit/loan losses	(271)		(803)
Construction [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		44,866
Allowance for credit/loan losses		(288)
Construction [Member] | Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			55,318
Allowance for credit/loan losses		(803)
Construction [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			(10,452)
Allowance for credit/loan losses		515
Consumer Mortgage [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	157,316
Allowance for credit/loan losses	(693)		(1,268)
Consumer Mortgage [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		149,787
Allowance for credit/loan losses		(688)
Consumer Mortgage [Member] | Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			194,125
Allowance for credit/loan losses		(1,268)
Consumer Mortgage [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			(44,338)
Allowance for credit/loan losses		580
Home Equity Line of Credit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	43,323
Allowance for credit/loan losses	(186)
Home Equity Line of Credit [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		44,243
Allowance for credit/loan losses		(201)
Home Equity Line of Credit [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			44,243
Allowance for credit/loan losses		(201)
Consumer Installment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	9,951
Allowance for credit/loan losses	(47)		(233)
Consumer Installment [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		9,657
Allowance for credit/loan losses		(50)
Consumer Installment [Member] | Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			16,387
Allowance for credit/loan losses		(233)
Consumer Installment [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			(6,730)
Allowance for credit/loan losses		183
Consumer Indirect [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans	6,374
Allowance for credit/loan losses	$ (88)
Consumer Indirect [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans		6,383
Allowance for credit/loan losses		(91)
Consumer Indirect [Member] | Cumulative Effect of Adoption [Memnber] | Adoption Impact [Member] | ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Loans			$ 6,383
Allowance for credit/loan losses		$ (91)