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Regulatory Matters - Summary of Company's Actual Capital Amount and Ratios (Detail) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Home BancShares |  |
Common equity Tier 1 capital ratios: |  |
Common equity Tier 1 capital ratios, Actual, Amount | $ 2,609,823 | $ 2,399,919
Common equity Tier 1 capital ratios, Actual, Ratio | 0.1415 | 0.1291
Leverage ratios: |  |
Leverage ratios, Actual, Amount | $ 2,609,823 | $ 2,399,919
Leverage ratios, Actual, Ratio | 0.1244 | 0.1086
Tier 1 capital ratios: |  |
Tier 1 capital ratios, Actual, Amount | $ 2,609,823 | $ 2,399,919
Tier 1 capital ratios, Actual, Ratio | 0.1415 | 0.1291
Total risk-based capital ratios: |  |
Total risk-based capital ratios, Actual, Amount | $ 3,281,136 | $ 3,073,455
Total risk-based capital ratios, Actual, Ratio | 0.1779 | 0.1654
Centennial Bank |  |
Common equity Tier 1 capital ratios: |  |
Common equity Tier 1 capital ratios, Actual, Amount | $ 2,495,303 | $ 2,408,756
Common equity Tier 1 capital ratios, Actual, Ratio | 0.1360 | 0.1300
Common equity Tier 1 capital ratios, Minimum To Be Well-Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,192,608 | $ 1,204,684
Common equity Tier 1 capital ratios, Minimum To Be Well-Capitalized Under Prompt Corrective Action Provision, Ratio | 6.50% | 6.50%
Leverage ratios: |  |
Leverage ratios, Actual, Amount | $ 2,495,303 | $ 2,408,756
Leverage ratios, Actual, Ratio | 0.1192 | 0.1093
Leverage ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,046,688 | $ 1,101,831
Leverage ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Ratio | 0.0500 | 0.0500
Tier 1 capital ratios: |  |
Tier 1 capital ratios, Actual, Amount | $ 2,495,303 | $ 2,408,756
Tier 1 capital ratios, Actual, Ratio | 0.1360 | 0.1300
Tier 1 capital ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,467,825 | $ 1,482,688
Tier 1 capital ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Ratio | 0.0800 | 0.0800
Total risk-based capital ratios: |  |
Total risk-based capital ratios, Actual, Amount | $ 2,725,909 | $ 2,640,992
Total risk-based capital ratios, Actual, Ratio | 0.1485 | 0.1425
Total risk-based capital ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,835,629 | $ 1,853,354
Total risk-based capital ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Ratio | 0.1000 | 0.1000
Basel III | Home BancShares |  |
Common equity Tier 1 capital ratios: |  |
Common equity Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Amount | $ 1,290,867 | $ 1,300,831
Common equity Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Ratio | 7.00% | 7.00%
Leverage ratios: |  |
Leverage ratios, Minimum Capital Requirement - Basel III, Amount | $ 839,271 | $ 883,664
Leverage ratios, Minimum Capital Requirement - Basel III, Ratio | 0.0400 | 0.0400
Tier 1 capital ratios: |  |
Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Amount | $ 1,567,482 | $ 1,579,580
Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Ratio | 0.0850 | 0.0850
Total risk-based capital ratios: |  |
Total risk-based capital ratios, Minimum Capital Requirement - Basel III, Amount | $ 1,936,301 | $ 1,951,246
Total risk-based capital ratios, Minimum Capital Requirement - Basel III, Ratio | 0.1050 | 0.1050
Basel III | Centennial Bank |  |
Common equity Tier 1 capital ratios: |  |
Common equity Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Amount | $ 1,284,347 | $ 1,297,352
Common equity Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Ratio | 7.00% | 7.00%
Leverage ratios: |  |
Leverage ratios, Minimum Capital Requirement - Basel III, Amount | $ 837,350 | $ 881,464
Leverage ratios, Minimum Capital Requirement - Basel III, Ratio | 0.0400 | 0.0400
Tier 1 capital ratios: |  |
Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Amount | $ 1,559,564 | $ 1,575,356
Tier 1 capital ratios, Minimum Capital Requirement - Basel III, Ratio | 0.0850 | 0.0850
Total risk-based capital ratios: |  |
Total risk-based capital ratios, Minimum Capital Requirement - Basel III, Amount | $ 1,927,410 | $ 1,946,021
Total risk-based capital ratios, Minimum Capital Requirement - Basel III, Ratio | 0.1050 | 0.1050

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