v3.26.1
Regulatory Matters - Summary of Company's and Equity Bank's Capital Amounts and Ratios (Detail)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 0.10  
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 0.08  
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 6.50%  
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 0.05  
Equity Bancshares, Inc. [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, Actual Amount $ 840,637 $ 769,823
Total capital to risk weighted assets, Actual Ratio 0.1436 0.1631
Tier 1 capital to risk weighted assets, Actual Amount $ 700,029 $ 641,476
Tier 1 capital to risk weighted assets, Actual Ratio 0.1196 0.1359
Common equity Tier 1 capital to risk weighted assets, Actual Amount $ 675,629 $ 617,168
Common equity Tier 1 capital to risk weighted assets, Actual Ratio 0.1154 0.1308
Tier 1 leverage to average assets, Actual Amount $ 700,029 $ 641,476
Tier 1 leverage to average assets, Actual Ratio 0.0959 0.1064
Equity Bancshares, Inc. [Member] | Base III Phase-In [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 614,699 $ 495,484
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.105 0.105
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 497,613 $ 401,106
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.085 0.085
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 409,799 $ 330,323
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 7.00% 7.00%
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 292,121 $ 241,199
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.04 0.04
Equity Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, Actual Amount $ 807,147 $ 691,869
Total capital to risk weighted assets, Actual Ratio 0.1382 0.148
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 584,170 $ 467,485
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 0.10 0.10
Tier 1 capital to risk weighted assets, Actual Amount $ 740,401 $ 637,359
Tier 1 capital to risk weighted assets, Actual Ratio 0.1267 0.1363
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 467,336 $ 373,988
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 0.08 0.08
Common equity Tier 1 capital to risk weighted assets, Actual Amount $ 740,401 $ 637,359
Common equity Tier 1 capital to risk weighted assets, Actual Ratio 0.1267 0.1363
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 379,710 $ 303,866
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 6.50% 6.50%
Tier 1 leverage to average assets, Actual Amount $ 740,401 $ 637,359
Tier 1 leverage to average assets, Actual Ratio 0.1018 0.106
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 363,827 $ 300,753
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio 0.05 0.05
Equity Bank [Member] | Base III Phase-In [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 613,378 $ 490,860
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.105 0.105
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 496,544 $ 397,363
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.085 0.085
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 408,919 $ 327,240
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 7.00% 7.00%
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Amount $ 291,061 $ 240,602
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.04 0.04