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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
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%