Regulatory Matters - Summary of Company's Actual Capital Amount and Ratios (Detail) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
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

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/1943274/2147477270/942-505-50-1

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-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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