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Subsequent Events (Notes)	9 Months Ended
Subsequent Events (Notes)	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS On October 10, 2016, the Company entered into a definitive merger agreement to acquire Jefferson County Bancshares, Inc. (“JCB”). JCB and its wholly-owned subsidiary, Eagle Bank and Trust Company of Missouri, have approximately $935 million in assets, $670 million in loans, and $763 million in deposits as of June 30, 2016. JCB operates 13 full service retail and commercial banking offices in metropolitan St. Louis and Perry County, Missouri. JCB shareholders will receive, based on their election, cash consideration in an amount of $85.39 per share of JCB common stock or 2.75 shares of EFSC common stock per share of JCB common stock. Aggregate consideration at the closing will be 3.3 million shares of EFSC common stock and approximately $26.6 million in cash, subject to adjustment for any JCB stock option exercises. Based on EFSC’s 15-day volume weighted average closing stock price of $31.52 as of October 10, 2016, the overall transaction has an estimated value of $130.6 million, including JCB’s common stock and stock options. The transaction is anticipated to close in early 2017, and is subject to normal and customary closing conditions, including but not limited to, regulatory approval and approval by JCB shareholders.