Condensed Financial Information (Parent Company Only) - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Income Statements, Captions [Line Items]
Interest income	$ 186,162	$ 159,018	$ 162,830
Expenses
Interest expense	110,681	87,694	25,418
Net income (loss) and net income (loss) allocable to common stockholders	62,621	7,821	57,688
Equity Bancshares, Inc. [Member]
Condensed Income Statements, Captions [Line Items]
Dividends from Equity Bank	25,000	32,500	33,903
Interest income	291
Other income	295	542	4
Total income	25,586	33,042	33,907
Expenses
Interest expense	7,668	7,678	6,796
Other expenses	(4,845)	3,058	2,516
Total expenses	2,823	10,736	9,312
Income before income tax and equity in undistributed income (loss) of subsidiaries	22,763	22,306	24,595
Income tax benefit	3,297	2,114	2,039
Income before equity in undistributed income (loss) of subsidiaries	26,060	24,420	26,634
Equity in undistributed income (loss)	35,468	(17,844)	31,462
Net income (loss) and net income (loss) allocable to common stockholders	62,621	7,821	57,688
Equity Bancshares, Inc. [Member] | EBAC [Member]
Expenses
Equity in undistributed income (loss)	(358)	(305)	(413)
Equity Bancshares, Inc. [Member] | ERMI [Member]
Expenses
Equity in undistributed income (loss)	$ 1,451	$ 1,550	$ 5