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Acquisitions & Divestitures - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 10, 2017
USD ($)
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     85.39
Business Acquisition, Goodwill, Expected Tax Deductible Amount     $ 83,600,000
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 $ 1,700,000 $ 1,400,000  
Fair Value Discount Recorded to Portfolio Loans $ 24,200,000