Loans - Summary of Activity in Allowance for Loan and Lease Losses and Allowance for Credit Losses for Unfunded Loan Commitments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		$ 3,203	$ 2,858
Provision for credit losses		75	105
CECL Adoption Adjustment	[1]	412
Loans charged-off		(6)	(3)
Recoveries of loans previously charged off		9	57
Ending balance		3,693	3,017
Total Allowance for credit losses for loans and unfunded loan commitments		4,358
Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	0
CECL Adoption Adjustment	[1],[2]	665
Loans charged-off	[2]	0
Recoveries of loans previously charged off	[2]	0
Ending balance	[2]	665
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		1,944	1,657
Provision for credit losses		54	105
CECL Adoption Adjustment	[1]	666
Loans charged-off		0	0
Recoveries of loans previously charged off		5	52
Ending balance		2,669	1,814
Total Allowance for credit losses for loans and unfunded loan commitments		3,309
Commercial [Member] | Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	0
CECL Adoption Adjustment	[1],[2]	640
Loans charged-off	[2]	0
Recoveries of loans previously charged off	[2]	0
Ending balance	[2]	640
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		752	745
Provision for credit losses		21	0
CECL Adoption Adjustment	[1]	75
Loans charged-off		0	0
Recoveries of loans previously charged off		0	0
Ending balance		848	745
Total Allowance for credit losses for loans and unfunded loan commitments		873
Residential [Member] | Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	0
CECL Adoption Adjustment	[1],[2]	25
Loans charged-off	[2]	0
Recoveries of loans previously charged off	[2]	0
Ending balance	[2]	25
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance		507	456
Provision for credit losses		0	0
CECL Adoption Adjustment	[1]	(329)
Loans charged-off		(6)	(3)
Recoveries of loans previously charged off		4	5
Ending balance		176	$ 458
Total Allowance for credit losses for loans and unfunded loan commitments		176
Consumer [Member] | Unfunded Loan Commitments [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	[2]	0
Provision for credit losses	[2]	0
CECL Adoption Adjustment	[1],[2]	0
Loans charged-off	[2]	0
Recoveries of loans previously charged off	[2]	0
Ending balance	[2]	$ 0

[1] On January 1, 2023, the Company adopted ASU 2016-13 ("CECL"). See Note 2 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.