v3.26.1
Regulatory Matters - Summary of Company's and Equity Bank's Capital Amounts and Ratios (Detail)
$ in Thousands
Jun. 30, 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 $ 858,212 $ 769,823
Total capital to risk weighted assets, Actual Ratio 0.1466 0.1631
Tier 1 capital to risk weighted assets, Actual Amount $ 717,415 $ 641,476
Tier 1 capital to risk weighted assets, Actual Ratio 0.1226 0.1359
Common equity Tier 1 capital to risk weighted assets, Actual Amount $ 692,922 $ 617,168
Common equity Tier 1 capital to risk weighted assets, Actual Ratio 0.1184 0.1308
Tier 1 leverage to average assets, Actual Amount $ 717,415 $ 641,476
Tier 1 leverage to average assets, Actual Ratio 0.0997 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 $ 614,610 $ 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 $ 497,542 $ 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 $ 409,740 $ 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 $ 287,959 $ 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 $ 831,076 $ 691,869
Total capital to risk weighted assets, Actual Ratio 0.1422 0.148
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 584,387 $ 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 $ 764,162 $ 637,359
Tier 1 capital to risk weighted assets, Actual Ratio 0.1308 0.1363
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 467,509 $ 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 $ 764,162 $ 637,359
Common equity Tier 1 capital to risk weighted assets, Actual Ratio 0.1308 0.1363
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 379,851 $ 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 $ 764,162 $ 637,359
Tier 1 leverage to average assets, Actual Ratio 0.1064 0.106
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount $ 359,137 $ 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 $ 613,606 $ 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 $ 496,729 $ 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 $ 409,071 $ 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 $ 287,309 $ 240,602
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio 0.04 0.04