Loans - Summary of Activity in Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		$ 3,203	$ 2,858
Provision for credit losses		300	222
CECL Adoption Adjustment	[1]	412
Loans charged-off		(10)	(10)
Recoveries of loans previously charged off		39	133
Ending balance		3,734	3,203
Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	210
CECL Adoption Adjustment	[1],[2]	665
Ending balance	[2]	875	0
Total Allowance for credit losses for loans and unfunded loan commitments		4,609
Allowance for Credit Losses for Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Provision for credit losses		90	222
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		1,944	1,657
Provision for credit losses			222
CECL Adoption Adjustment	[1]	666
Loans charged-off		0	0
Recoveries of loans previously charged off		19	65
Ending balance		2,693	1,944
Commercial [Member] | Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	207
CECL Adoption Adjustment	[1],[2]	640
Ending balance	[2]	847	0
Total Allowance for credit losses for loans and unfunded loan commitments		3,540
Commercial [Member] | Allowance for Credit Losses for Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Provision for credit losses		64
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		752	745
Provision for credit losses			0
CECL Adoption Adjustment	[1]	75
Loans charged-off		0	0
Recoveries of loans previously charged off		0	7
Ending balance		849	752
Residential [Member] | Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	3
CECL Adoption Adjustment	[1],[2]	25
Ending balance	[2]	28	0
Total Allowance for credit losses for loans and unfunded loan commitments		877
Residential [Member] | Allowance for Credit Losses for Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Provision for credit losses		22
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		507	456
Provision for credit losses			0
CECL Adoption Adjustment	[1]	(329)
Loans charged-off		(10)	(10)
Recoveries of loans previously charged off		20	61
Ending balance		192	507
Consumer [Member] | Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses		0
CECL Adoption Adjustment		0
Ending balance		0	$ 0	[2]
Total Allowance for credit losses for loans and unfunded loan commitments		192
Consumer [Member] | Allowance for Credit Losses for Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Provision for credit losses		$ 4

[1] On January 1, 2023, the Company adopted ASU 2016-13 ("CECL"). See Note 1 for additional information regarding the adoption of ASU 2016-13.

[2] The allowance for credit losses for unfunded loan commitments is included in other liabilities on the Company's Consolidated Balance Sheets.