Employee Benefit Plans (Detail) - USD ($) shares in Millions		12 Months Ended
	Apr. 20, 2007	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2011
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)		1.1
Discretionary contributions amount		$ 0	$ 0	$ 0
Employee benefits plan expense		3,300,000	3,400,000	3,100,000
Chairman's Retirement Plan
Employee Benefit Plans [Line Items]
Employee benefits plan expense		71,075	84,787	97,449
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