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Acquisitions & Divestitures - Narrative (Details) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 10, 2017 USD ($) $ / shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of operating JCB branches |  |  | 13
Total cash paid to JCB shareholders and holders of JCB stock options |  |  | $ 29,300,000
Cash consideration per share to JCB shareholders | $ / shares |  |  | $ 85.39
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | $ 87,000,000
Common stock offered per share |  |  | 2.75
Total shares awarded to JCB shareholders |  |  | 3,300,000
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 |
Fair Value Discount Recorded to Portfolio Loans | 24,700,000 |  |
Fair Value Discount Recorded to Fixed Assets | 1,100,000 |  |
Assets | $ 200,000 |  |

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