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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019
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Federal Home Loan Banks [Abstract] |  |  |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount | $ 164,322 | $ 152,855 |
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount | 178,635 | 160,562 |
Tier 1 Capital to Risk Weighted Assets Actual, Amount | 164,322 | 152,855 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount | $ 164,322 | $ 152,855 |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 11.63% | 11.71% |
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio | 12.64 | 12.30 |
Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 11.63 | 11.71 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio | 9.08 | 10.02 | 4.0
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount | $ 63,542 | $ 58,725 |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 113,032 | 104,400 |
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 84,774 | 78,300 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount | $ 72,419 | $ 61,050 |
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 4.50% | 4.50% |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 8.00 | 8.00 | 8.0
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 6.00 | 6.00 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio | 4.00 | 4.00 |
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 91,783 | $ 84,825 |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 141,290 | 130,500 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 113,032 | 104,400 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 90,524 | $ 76,312 |
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50% |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 10.00 | 10.00 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 8.00 | 8.00 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 5.00 | 5.00 |

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