Summary of Significant Accounting Policies - Summary of Category of Loans and Impact of Change from Adoption (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	$ 701,481		$ 626,958
Allowance for credit/loan losses	(6,607)		(6,838)	$ (7,618)
Net loans	694,797		620,333
ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans		$ 626,958
Deferred loan (fees) costs, net		213
Allowance for credit/loan losses		(6,279)
Net loans		620,892
Pre-adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans			626,958
Deferred loan (fees) costs, net			213
Allowance for credit/loan losses		(6,838)	(6,838)
Net 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 loans			559
Commercial and Industrial [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total loans	152,125
Allowance for credit/loan losses	(1,737)		(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	190,702		231,785
Allowance for credit/loan losses	(1,637)		(2,760)	$ (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	82,687
Allowance for credit/loan losses	(1,200)
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	49,214
Allowance for credit/loan losses	(333)		(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	166,891
Allowance for credit/loan losses	(1,107)		(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	43,269
Allowance for credit/loan losses	(288)
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	10,636
Allowance for credit/loan losses	(76)		(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	5,957
Allowance for credit/loan losses	$ (229)
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)