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Regulatory Matters - Summary of Company's Actual Capital Amount and Ratios (Detail) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Home BancShares |  |
Common equity Tier 1 capital ratios: |  |
Common equity Tier 1 capital ratios, Actual, Amount | $ 2,787,116 | $ 2,609,823
Common equity Tier 1 capital ratios, Actual, Ratio | 0.1511 | 0.1415
Leverage ratios: |  |
Leverage ratios, Actual, Amount | $ 2,787,116 | $ 2,609,823
Leverage ratios, Actual, Ratio | 0.1305 | 0.1244
Tier 1 capital ratios: |  |
Tier 1 capital ratios, Actual, Amount | $ 2,787,116 | $ 2,609,823
Tier 1 capital ratios, Actual, Ratio | 0.1511 | 0.1415
Total risk-based capital ratios: |  |
Total risk-based capital ratios, Actual, Amount | $ 3,458,014 | $ 3,281,136
Total risk-based capital ratios, Actual, Ratio | 0.1874 | 0.1779
Centennial Bank |  |
Common equity Tier 1 capital ratios: |  |
Common equity Tier 1 capital ratios, Actual, Amount | $ 2,604,830 | $ 2,495,303
Common equity Tier 1 capital ratios, Actual, Ratio | 0.1417 | 0.1360
Common equity Tier 1 capital ratios, Minimum To Be Well-Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,194,876 | $ 1,192,608
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 | $ 2,604,830 | $ 2,495,303
Leverage ratios, Actual, Ratio | 0.1223 | 0.1192
Leverage ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,064,935 | $ 1,046,688
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 | $ 2,604,830 | $ 2,495,303
Tier 1 capital ratios, Actual, Ratio | 0.1417 | 0.1360
Tier 1 capital ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,470,617 | $ 1,467,825
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 | $ 2,835,636 | $ 2,725,909
Total risk-based capital ratios, Actual, Ratio | 0.1543 | 0.1485
Total risk-based capital ratios, Minimum To Be Well Capitalized Under Prompt Corrective Action Provision, Amount | $ 1,837,742 | $ 1,835,629
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 | $ 1,291,348 | $ 1,290,867
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 | $ 854,602 | $ 839,271
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 | $ 1,568,065 | $ 1,567,482
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 | $ 1,937,022 | $ 1,936,301
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 | $ 1,286,790 | $ 1,284,347
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 | $ 851,948 | $ 837,350
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 | $ 1,562,530 | $ 1,559,564
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 | $ 1,929,629 | $ 1,927,410
Total risk-based capital ratios, Minimum Capital Requirement - Basel III, Ratio | 0.1050 | 0.1050

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