Regulatory Matters - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Periodic increase of capital conservation buffer	0.625%
Total risk-based capital ratio, Actual Ratio	0.1929	0.2034
Tier1 Capital (to Risk-Weighted Assets), Actual Ratio	0.1822	0.1935
Common Tier1 Capital (to Risk-Weighted Assets), Actual Ratio	0.1822	0.1935
Tier1 Leverage ratio, Actual Ratio	0.1096	0.1113
Required tangible net assets	$ 2,000,000
Tangible net assets, total	47,766,000
Subsidiary bank's reserve balance	$ 0	$ 0
Minimum [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer	0.625%
Maximum [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer	2.50%