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Employee Benefit Plans (Detail) - USD ($)
shares in Millions
 12 Months Ended
Apr. 20, 2007
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2011
Chairman's Retirement Plan          
Employee Benefit Plans [Line Items]          
Employee benefits plan expense   $ 84,787 $ 97,449 $ 109,140  
Supplemental retirement benefit $ 250,000        
Additional defined benefit obligation, term 10 years        
Employee benefits plan vested percentage         100.00%
Supplemental retirement benefit plan during year   $ 250,000 250,000 250,000  
Home BancShares, Inc. 401(k) and Employee Stock Ownership Plan          
Employee Benefit Plans [Line Items]          
Shares of company common stock held by employee (in shares)   1.3      
Discretionary contributions amount   $ 0 0 0  
Employee benefits plan expense   $ 3,400,000 $ 3,100,000 $ 2,500,000