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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2019
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Federal Home Loan Banks [Abstract] |  |  |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount | $ 256,943 | $ 164,322 |
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount | 274,226 | 178,635 |
Tier 1 Capital to Risk Weighted Assets Actual, Amount | 256,943 | 164,322 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount | $ 256,943 | $ 164,322 |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 14.26% | 11.63% |
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio | 15.22 | 12.64 |
Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 14.26 | 11.63 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio | 10.25 | 9.08 | 4.0
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount | $ 81,074 | $ 63,542 |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 144,138 | 113,032 |
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 108,104 | 84,774 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount | $ 100,317 | $ 72,419 |
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 | $ 117,112 | $ 91,783 |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 180,173 | 141,290 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 144,138 | 113,032 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 125,396 | $ 90,524 |
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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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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