Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Detail) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 363,289,000	$ 104,013,000
Other assets	98,021,000	89,736,000
Total assets	5,034,592,000	4,981,651,000
LIABILITIES AND STOCKHOLDERS’ EQUITY
Bank stock loan	0	0
Subordinated debt	96,921,000	96,392,000
Interest payable and other liabilities	36,459,000	32,834,000
Total liabilities	4,581,732,000	4,571,593,000
Stockholders' equity	452,860,000	410,058,000	$ 500,631,000	$ 407,649,000
Total liabilities and stockholders’ equity	5,034,592,000	4,981,651,000
Equity Bancshares, Inc. [Member]
ASSETS
Cash and due from banks	12,729,000	12,108,000
Investment	531,272,000	490,755,000
Other assets	3,009,000	2,035,000
Total assets	552,226,000	508,628,000
LIABILITIES AND STOCKHOLDERS’ EQUITY
Subordinated debt	96,921,000	96,392,000
Interest payable and other liabilities	2,445,000	2,178,000
Total liabilities	99,366,000	98,570,000
Stockholders' equity	452,860,000	410,058,000
Total liabilities and stockholders’ equity	552,226,000	508,628,000
Equity Bancshares, Inc. [Member] | EBAC [Member]
ASSETS
Investment	3,261,000	3,325,000
Equity Bancshares, Inc. [Member] | ERMI [Member]
ASSETS
Investment	$ 1,955,000	$ 405,000