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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Enterprise Financial Services Corp [Member]    
Total Capital (to Risk Weighted Assets) [Abstract]    
Actual, Amount $ 506,349 $ 418,367
Actual, Ratio 13.48% 11.85%
For Capital Adequacy Purposes, Amount $ 300,573 $ 282,442
For Capital Adequacy Purposes, Ratio 8.00% 8.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 0 $ 0
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.00% 0.00%
Tier 1 Capital (to Risk Weighted Assets) [Abstract]    
Actual, Amount $ 412,865 $ 374,676
Actual, Ratio 10.99% 10.61%
For Capital Adequacy Purposes, Amount $ 225,430 $ 211,831
For Capital Adequacy Purposes, Ratio 6.00% 6.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 0 $ 0
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.00% 0.00%
Tier One Common Equity Capital $ 357,729 $ 319,553
Tier One Common Equity Capital to Risk Weighted Assets 9.52% 9.05%
Tier One Common Equity Capital Required for Capital Adequacy $ 169,072 $ 158,873
Tier One Common Equity Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Tier One Common Equity Capital Required to be Well Capitalized $ 0 $ 0
Tier One Common Equity Capital Required to be Well Capitalized to Risk Weighted Assets 0.00% 0.00%
Tier 1 Capital (to Average Assets) [Abstract]    
Actual, Amount $ 412,865 $ 374,676
Actual, Ratio 10.42% 10.71%
For Capital Adequacy Purposes, Amount $ 158,480 $ 139,893
For Capital Adequacy Purposes, Ratio 4.00% 4.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 0 $ 0
To Be Well Capitalized Under Applicable Action Provisions, Ratio 0.00% 0.00%
Enterprise Bank and Trust [Member]    
Total Capital (to Risk Weighted Assets) [Abstract]    
Actual, Amount $ 430,981 $ 386,531
Actual, Ratio 11.53% 10.98%
For Capital Adequacy Purposes, Amount $ 298,982 $ 281,632
For Capital Adequacy Purposes, Ratio 8.00% 8.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 373,728 $ 352,040
To Be Well Capitalized Under Applicable Action Provisions, Ratio 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets) [Abstract]    
Actual, Amount $ 387,497 $ 342,840
Actual, Ratio 10.37% 9.74%
For Capital Adequacy Purposes, Amount $ 224,237 $ 211,224
For Capital Adequacy Purposes, Ratio 6.00% 6.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 298,982 $ 281,632
To Be Well Capitalized Under Applicable Action Provisions, Ratio 8.00% 8.00%
Tier One Common Equity Capital $ 387,461 $ 342,816
Tier One Common Equity Capital to Risk Weighted Assets 10.37% 9.74%
Tier One Common Equity Capital Required for Capital Adequacy $ 168,178 $ 158,418
Tier One Common Equity Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Tier One Common Equity Capital Required to be Well Capitalized $ 242,923 $ 228,826
Tier One Common Equity Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
Tier 1 Capital (to Average Assets) [Abstract]    
Actual, Amount $ 387,497 $ 342,840
Actual, Ratio 9.81% 9.84%
For Capital Adequacy Purposes, Amount $ 157,933 $ 139,311
For Capital Adequacy Purposes, Ratio 4.00% 4.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 197,417 $ 174,138
To Be Well Capitalized Under Applicable Action Provisions, Ratio 5.00% 5.00%