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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Enterprise Financial Services Corp [Member] |  |
Total Capital (to Risk Weighted Assets) [Abstract] |  |
Actual, Amount | $ 589,047 | $ 506,349
Actual, Ratio | 12.21% | 13.48%
For Capital Adequacy Purposes, Amount | $ 385,816 | $ 300,573
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 | $ 496,045 | $ 412,865
Actual, Ratio | 10.29% | 10.99%
For Capital Adequacy Purposes, Amount | $ 289,362 | $ 225,430
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 | $ 428,397 | $ 357,729
Tier One Common Equity Capital to Risk Weighted Assets | 8.88% | 9.52%
Tier One Common Equity Capital Required for Capital Adequacy | $ 217,021 | $ 169,072
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 | $ 496,045 | $ 412,865
Actual, Ratio | 9.72% | 10.42%
For Capital Adequacy Purposes, Amount | $ 204,087 | $ 158,480
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 | $ 546,314 | $ 430,981
Actual, Ratio | 11.36% | 11.53%
For Capital Adequacy Purposes, Amount | $ 384,791 | $ 298,982
For Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount | $ 480,989 | $ 373,728
To Be Well Capitalized Under Applicable Action Provisions, Ratio | 10.00% | 10.00%
Tier 1 Capital (to Risk Weighted Assets) [Abstract] |  |
Actual, Amount | $ 503,312 | $ 387,497
Actual, Ratio | 10.46% | 10.37%
For Capital Adequacy Purposes, Amount | $ 288,593 | $ 224,237
For Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount | $ 384,791 | $ 298,982
To Be Well Capitalized Under Applicable Action Provisions, Ratio | 8.00% | 8.00%
Tier One Common Equity Capital | $ 503,264 | $ 387,461
Tier One Common Equity Capital to Risk Weighted Assets | 10.46% | 10.37%
Tier One Common Equity Capital Required for Capital Adequacy | $ 216,445 | $ 168,178
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 | $ 312,643 | $ 242,923
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 | $ 503,312 | $ 387,497
Actual, Ratio | 9.68% | 9.81%
For Capital Adequacy Purposes, Amount | $ 207,885 | $ 157,933
For Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
To Be Well Capitalized Under Applicable Action Provisions, Amount | $ 259,856 | $ 197,417
To Be Well Capitalized Under Applicable Action Provisions, Ratio | 5.00% | 5.00%

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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