v3.7.0.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2017
Aug. 04, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Trading Symbol EQBK  
Entity Registrant Name EQUITY BANCSHARES INC  
Entity Central Index Key 0001227500  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Class A Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   12,019,806
Class B Non-Voting Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   186,513