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Income Taxes - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) state | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Feb. 10, 2017 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |
Statutory federal income tax rate | 24.70% | 38.00% | 35.00% | 35.00% |
Income Tax Examination [Line Items] |  |  |  |  |
Income Tax Reconciliation Enacted Tax Rate Change | $ 12,100,000 |  |  |  |
Tax credits and other tax benefits from low-income housing tax credit |  |  | $ 1,100,000 | $ 1,100,000 |
Amount recognized as a component of income tax expense related low-income housing tax credit | 300,000 | $ 200,000 | 200,000 |  |
Investments related to low-income housing tax credits | 1,300,000 | 1,400,000 |  |  |
Impairment losses recognized from forfeiture or ineligibility | 0 |  | 0 | 0 |
Future capital commitments related to low-income housing tax credit investments | 4,800,000 |  |  |  |
Deferred Tax Assets, Net | $ 22,502,000 | 33,751,000 |  |  |
Number of states the company files income tax returns in | state | 9 |  |  |  |
Unrecognized tax benefits | $ 1,244,000 | 1,180,000 | 1,359,000 | $ 1,884,000 |
Unrecognized tax benefits that would impact effective tax rate | 800,000 | 800,000 | 900,000 |  |
Reduction in unrecognized tax benefit that is reasonably possible due to a lapse of statute of limitations | $ 300,000 |  |  |  |
Duration of unrecognized tax benefits | 12 months |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
State valuation allowance |  |  | $ 0 |  |
Other Assets |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Deferred Tax Assets, Net | $ 22,500,000 | $ 33,800,000 |  |  |
As Recorded by EFSC [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Deferred Tax Assets, State Taxes | $ 8,600,000 |  |  |  | $ 8,625,000

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References No definition available. + Details
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