Regulatory Matters - Schedule of Actual and Required Capital Amounts and Ratios of the Bank (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Compliance With Regulatory Capital Requirements Under Banking Regulations [Abstract]
Common Equity Tier 1 Capital to Risk- Weighted Assets, Actual Amount	$ 67,153	$ 63,764
Total Capital to Risk- Weighted Assets, Actual Amount	71,094	66,954
Tier 1 Capital to Risk- Weighted Assets, Actual Amount	67,153	63,764
Tier I Capital to Average Assets, Actual Amount	$ 67,153	$ 63,764
Common Equity Tier 1 Capital to Risk- Weighted Assets, Actual Ratio	21.32%	25.08%
Total Capital to Risk- Weighted Assets, Actual Ratio	22.57%	26.33%
Tier 1 Capital to Risk- Weighted Assets, Actual Ratio	21.32%	25.08%
Tier I Capital to Average Assets, Actual Ratio	16.22%	16.64%
Common Equity Tier 1 Capital to Risk- Weighted Assets, For Capital Adequacy Purposes Amount	$ 14,172	$ 11,441
Total Capital to Risk- Weighted Assets, For Capital Adequacy Purposes Amount	25,194	20,340
Tier 1 Capital to Risk- Weighted Assets, For Capital Adequacy Purposes Amount	18,895	15,255
Tier I Capital to Average Assets, For Capital Adequacy Purposes Amount	$ 16,558	$ 15,327
Common Equity Tier 1 Capital to Risk- Weighted Assets, For Capital Adequacy Purposes Ratio	4.50%	4.50%
Total Capital to Risk- Weighted Assets, For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 Capital to Risk- Weighted Assets, For Capital Adequacy Purposes Ratio	6.00%	6.00%
Tier I Capital to Average Assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Common Equity Tier 1 Capital to Risk-Weighted Assets, To Be Well Capitalized Under prompt Corrective Action Provisions Amount	$ 20,470	$ 16,526
Total Capital to Risk- Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	31,492	25,425
Tier 1 Capital to Risk- Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	25,194	20,340
Tier I Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 20,697	$ 19,159
Common Equity Tier 1 Capital to Risk-Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Total Capital to Risk- Weighted Assets, To Be Well Capitalization Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 Capital to Risk- Weighted Assets, To Be Well Capitalization Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Tier I Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%

Common equity tier one capital required to be well capitalized to Risk weighted assets.

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Common equity tier one risk based capital required for capital adequacy.

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Common tier one risk based capital required for capital adequacy to risk weighted assets.

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Schedule of compliance with regulatory capital requirements under banking regulations.

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Amount of total capital as defined by regulatory framework.

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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-Name Accounting Standards Codification
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