v3.3.1.900

Compensation Plans Outstanding Longer Term Incentive Awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Outstanding Long Term Incentive Awards [Line Items] |  |
Target Shares Issuable as Long Term Incentive Awards | $ 126,000 | $ 107,642
Maximum Shares Issuable as Long Term Incentive Awards | 157,250 | 141,577
Unrecognized Compensation Cost - Long Term Incentives | $ 1,454,417 | $ 745,873
Share-based Compensation Arrangement By Share-based Payment Award, Grants In Period, Weighted Average Grant Date Fair Value | $ 19,210 | $ 16,840

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- Definition Maximum Shares Issuable as Long Term Incentive Awards + References No definition available. + Details
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- Definition [Line Items] for Outstanding Long Term Incentive Awards [Table] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Grants In Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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Period Type: | duration

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- Definition Target Shares Issuable as Long Term Incentive Awards + References No definition available. + Details
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- Definition Unrecognized Compensation Cost - Long Term Incentives + References No definition available. + Details
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Namespace Prefix: | efsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration