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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Banking And Thrift [Abstract] |  |  |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount | $ 152,855 |  | $ 114,978
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount | 160,562 |  | 122,027
Tier 1 Capital to Risk Weighted Assets Actual, Amount | 152,855 |  | 114,978
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount | $ 152,855 |  | $ 114,978
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 11.71% |  | 12.67%
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio | 12.30% |  | 13.45%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 11.71% |  | 12.67%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio | 10.02% | 4.00% | 10.54%
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount | $ 58,725 |  | $ 40,834
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 104,400 |  | 72,594
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 78,300 |  | 54,446
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount | $ 61,050 |  | $ 43,644
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% | 8.00%
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 | $ 84,825 |  | $ 58,983
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 130,500 |  | 90,743
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 104,400 |  | 72,594
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 76,312 |  | $ 54,555
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 Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized under regulatory framework for prompt corrective action. + 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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