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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Enterprise Financial Services Corp [Member]    
Total Capital (to Risk Weighted Assets) [Abstract]    
Actual, Amount $ 650,859 $ 589,047
Actual, Ratio 13.02% 12.21%
For Capital Adequacy Purposes, Amount $ 399,949 $ 385,816
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 $ 556,958 $ 496,045
Actual, Ratio 11.14% 10.29%
For Capital Adequacy Purposes, Amount $ 299,962 $ 289,362
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 $ 489,301 $ 428,397
Tier One Common Equity Capital to Risk Weighted Assets 9.79% 8.88%
Tier One Common Equity Capital Required for Capital Adequacy $ 224,971 $ 217,021
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 $ 556,958 $ 496,045
Actual, Ratio 10.29% 9.72%
For Capital Adequacy Purposes, Amount $ 216,423 $ 204,087
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 $ 611,197 $ 546,314
Actual, Ratio 12.26% 11.36%
For Capital Adequacy Purposes, Amount $ 398,969 $ 384,791
For Capital Adequacy Purposes, Ratio 8.00% 8.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 498,711 $ 480,989
To Be Well Capitalized Under Applicable Action Provisions, Ratio 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets) [Abstract]    
Actual, Amount $ 567,296 $ 503,312
Actual, Ratio 11.38% 10.46%
For Capital Adequacy Purposes, Amount $ 299,227 $ 288,593
For Capital Adequacy Purposes, Ratio 6.00% 6.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 398,969 $ 384,791
To Be Well Capitalized Under Applicable Action Provisions, Ratio 8.00% 8.00%
Tier One Common Equity Capital $ 567,239 $ 503,264
Tier One Common Equity Capital to Risk Weighted Assets 11.37% 10.46%
Tier One Common Equity Capital Required for Capital Adequacy $ 224,420 $ 216,445
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 $ 324,162 $ 312,643
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 $ 567,296 $ 503,312
Actual, Ratio 10.52% 9.68%
For Capital Adequacy Purposes, Amount $ 215,623 $ 207,885
For Capital Adequacy Purposes, Ratio 4.00% 4.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount $ 269,529 $ 259,856
To Be Well Capitalized Under Applicable Action Provisions, Ratio 5.00% 5.00%