Regulatory Matters - Summary of Company's Actual Capital Amount and Ratios (Detail) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
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

Common equity tier one risk based capital required for capital adequacy to risk weighted assets.

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Amount of total capital as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

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