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Regulatory Matters - Summary of Actual and Required Capital Ratio and Bank under Basel III Capital Rules (Detail) - Home Bank N.A. - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common equity tier 1 capital ratio, actual amount | $ 240,176 | $ 230,708
Tier 1 risk-based capital, Actual amount | 240,176 | 230,708
Total risk-based capital, Actual amount | 258,044 | 247,056
Tier 1 leverage capital, Actual amount | $ 240,176 | $ 230,708
Common equity tier 1 capital ratio, actual ratio (percent) | 14.22% | 14.55%
Tier 1 risk-based capital, Actual ratio (percent) | 14.22% | 14.55%
Total risk-based capital, Actual ratio (percent) | 15.28% | 15.59%
Tier 1 leverage capital, Actual ratio (percent) | 11.17% | 11.15%
Common equity tier 1 capital ratio, Minimum Capital Required - Basel III Fully Phased-In, Amount | $ 118,213 | $ 110,962
Tier 1 risk-based capital, Minimum Capital Required - Basel III Fully Phased-In, Amount | 143,545 | 134,740
Total risk-based capital, Minimum Capital Required - Basel III Fully Phased-In, Amount | 177,320 | 166,443
Tier 1 leverage capital, Minimum Capital Required - Basel III Fully Phased-In, Amount | $ 86,004 | $ 82,744
Common equity tier 1 capital ratio, Minimum Capital Required - Basel III Fully Phased-In (percent) | 7.00% | 7.00%
Tier 1 risk-based capital, Minimum Capital Required - Basel III Fully Phased-In (percent) | 8.50% | 8.50%
Total risk-based capital, Minimum Capital Required - Basel III Fully Phased-In (percent) | 10.50% | 10.50%
Tier 1 leverage capital, Minimum Capital Required - Basel III Fully Phased-In (percent) | 4.00% | 4.00%
Common equity tier 1 capital ratio, minimum required to be well capitalized under prompt corrective action provisions amount | $ 109,769 | $ 103,036
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, amount | 135,101 | 126,814
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, amount | 168,876 | 158,517
Tier 1 leverage capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, amount | $ 107,506 | $ 103,430
Common equity tier 1 capital ratio, minimum required to be well capitalized under prompt corrective action provisions, Ratio (percent) | 6.50% | 6.50%
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (percent) | 8.00% | 8.00%
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (percent) | 10.00% | 10.00%
Tier 1 leverage capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (percent) | 5.00% | 5.00%

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