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Acquisitions & Divestitures - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 10, 2017 USD ($) $ / shares | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of operating JCB branches |  |  | 13 |
Total shares awarded to JCB shareholders |  | 0 | 3,299,864 | 0
Sale of Stock, Consideration Received Per Transaction | $ / shares |  |  | $ 85.39 |
EFSC common stock offered per share of JCB common stock |  |  | 2.75 |
Total cash paid to JCB shareholders and holders of JCB stock options |  |  | $ 29,300,000 |
EFSC Closing Stock Price |  |  | 42.95 |
Transaction value including JCB's common stock and stock options |  |  | 171,000,000 |
Business Combination, Acquisition Related Costs | $ 6,500,000 | $ 1,400,000 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | $ 87,000,000 |
Fair Value Discount Recorded to Portfolio Loans | $ 24,700,000 |  |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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