Regulatory Matters - Summary of Actual Capital Amounts and Ratios of Company and Bank (Detail) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual Amount	$ 100,547	$ 93,333
Tier 1 capital to risk-weighted assets, Actual Amount	93,260	86,285
Common equity tier 1 capital to risk-weighted assets, Actual Amount	93,260	86,285
Tier 1 leverage ratio, Actual Amount	$ 93,260	$ 86,285
Total capital to risk-weighted assets, Actual Ratio	17.3	16.6
Tier 1 capital to risk-weighted assets, Actual Ratio	16.0	15.4
Common equity tier 1 capital to risk-weighted assets, Actual Ratio	16.0	15.4
Tier 1 leverage ratio, Actual Ratio	8.2	8.5
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Amount	$ 46,599	$ 44,954
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Amount	34,949	33,716
Common equity tier I capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Amount	26,212	25,287
Tier 1 leverage ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 45,433	$ 40,511
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Ratio	8.0	8.0
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Ratio	6.0	6.0
Common equity tier I capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Ratio	4.5	4.5
Tier 1 leverage ratio, Minimum Required for Capital Adequacy Purposes Ratio	4.0	4.0
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	$ 58,248	$ 56,193
Tier 1 capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	46,599	44,954
Common equity tier I capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	37,861	36,526
Tier 1 leverage ratio, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	$ 56,791	$ 50,638
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	10.0	10.0
Tier 1 capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	8.0	8.0
Common equity tier I capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	6.5	6.5
Tier 1 leverage ratio, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	5.0	5.0
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual Amount	$ 101,999	$ 95,149
Tier 1 capital to risk-weighted assets, Actual Amount	94,712	88,101
Common equity tier 1 capital to risk-weighted assets, Actual Amount	94,712	88,101
Tier 1 leverage ratio, Actual Amount	$ 94,712	$ 88,101
Total capital to risk-weighted assets, Actual Ratio	17.5	16.9
Tier 1 capital to risk-weighted assets, Actual Ratio	16.3	15.7
Common equity tier 1 capital to risk-weighted assets, Actual Ratio	16.3	15.7
Tier 1 leverage ratio, Actual Ratio	8.3	8.7
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Amount	$ 46,615	$ 44,969
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Amount	34,961	33,727
Common equity tier I capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Amount	26,221	25,295
Tier 1 leverage ratio, Minimum Required for Capital Adequacy Purposes Amount	$ 45,441	$ 40,518
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Ratio	8.0	8.0
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Ratio	6.0	6.0
Common equity tier I capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes Ratio	4.5	4.5
Tier 1 leverage ratio, Minimum Required for Capital Adequacy Purposes Ratio	4.0	4.0
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	$ 58,268	$ 56,211
Tier 1 capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	46,615	44,969
Common equity tier I capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	37,875	36,537
Tier 1 leverage ratio, Minimum Required to be Well Capitalized Under Prompt Corrective Action Amount	$ 56,801	$ 50,647
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	10.0	10.0
Tier 1 capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	8.0	8.0
Common equity tier I capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	6.5	6.5
Tier 1 leverage ratio, Minimum Required to be Well Capitalized Under Prompt Corrective Action Ratio	5.0	5.0