Regulatory Matters - Additional Information (Detail)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total risk-based capital ratio, Actual Ratio	0.20	0.1962
Tier1 Capital (to Risk-Weighted Assets), Actual Ratio	0.1883	0.185
Common Tier1 Capital (to Risk-Weighted Assets), Actual Ratio	0.1883	0.185
Tier1 Leverage ratio, Actual Ratio	0.1249	0.1206
Required tangible net assets	$ 2,000,000
Tangible net assets, total	67,214,000
Subsidiary bank's reserve balance	$ 0	$ 0
Maximum [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer	2.50%