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Subordinated Debentures (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 shares | Nov. 01, 2021 | Nov. 01, 2016 USD ($)
Subordinated Borrowing [Line Items] |  |  |  |  |
Number of Unconsolidated Statutory Business Trusts | 10 |  |  |  |
Investments trust preferred securities | $ 2,100 |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | 118,105 | $ 105,540 |  |  |
Debt issuance costs | $ (1,136) | $ (1,267) |  |  |
Conversion of subordinated debt into common stock (in shares) | shares | 0 | 0 | 0 |  |
Senior Subordinated Notes [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Senior Subordinated Notes |  |  |  |  | $ 50,000
Subordinated Notes, Redemption Price |  |  |  | 100.00% |
Trust preferred securities [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 69,241 | $ 56,807 |  |  |
Trust preferred securities [Member] | EFSC Clayco Statutory Trust I |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 3,196 | 3,196 |  |  |
Maturity Date | Dec. 17, 2033 |  |  |  |
Call Date | Dec. 17, 2008 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 2.85% |  |  |  |
Trust preferred securities [Member] | EFSC Capital Trust II |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 5,155 | 5,155 |  |  |
Maturity Date | Jun. 17, 2034 |  |  |  |
Call Date | Jun. 17, 2009 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 2.65% |  |  |  |
Trust preferred securities [Member] | EFSC Statutory Trust III |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 11,341 | 11,341 |  |  |
Maturity Date | Dec. 15, 2034 |  |  |  |
Call Date | Dec. 15, 2009 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 1.97% |  |  |  |
Trust preferred securities [Member] | EFSC Clayco Statutory Trust II |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 4,124 | 4,124 |  |  |
Maturity Date | Sep. 15, 2035 |  |  |  |
Call Date | Sep. 15, 2010 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 1.83% |  |  |  |
Trust preferred securities [Member] | EFSC Statutory Trust IV |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 10,310 | 10,310 |  |  |
Maturity Date | Dec. 15, 2035 |  |  |  |
Call Date | Dec. 15, 2010 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 1.44% |  |  |  |
Trust preferred securities [Member] | EFSC Statutory Trust V |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 4,124 | 4,124 |  |  |
Maturity Date | Sep. 15, 2036 |  |  |  |
Call Date | Sep. 15, 2011 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 1.60% |  |  |  |
Trust preferred securities [Member] | EFSC Capital Trust VI |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 14,433 | 14,433 |  |  |
Maturity Date | Mar. 30, 2037 |  |  |  |
Call Date | Mar. 30, 2012 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 1.60% |  |  |  |
Trust preferred securities [Member] | EFSC Capital Trust VII |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 4,124 | 4,124 |  |  |
Maturity Date | Dec. 15, 2037 |  |  |  |
Call Date | Dec. 15, 2012 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Floating interest rate | 2.25% |  |  |  |
Trust preferred securities [Member] | JEFFCO Stat Trust I [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 8,153 | 0 |  |  |
Maturity Date | Feb. 22, 2031 |  |  |  |
Call Date | Feb. 22, 2011 |  |  |  |
Fixed interest rate | 10.20% |  |  |  |
Trust preferred securities [Member] | EFSC Capital Trust VIII |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Fixed interest rate | 9.00% |  |  |  |
Trust preferred securities [Member] | JEFFCO Stat Trust II [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 4,281 | 0 |  |  |
Maturity Date | Mar. 17, 2034 |  |  |  |
Call Date | Mar. 17, 2009 |  |  |  |
Description of variable rate | 3 Month LIBOR |  |  |  |
Fixed interest rate | 2.75% |  |  |  |
Senior Subordinated Notes [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | $ 50,000 | 50,000 |  |  |
Debt issuance costs | (1,136) | (1,267) |  |  |
Subordinated notes, net of issuance costs | $ 48,864 | $ 48,733 |  |  |
Maturity Date | Nov. 01, 2026 |  |  |  |
Call Date | Nov. 01, 2021 |  |  |  |
Floating interest rate | 3.387% |  |  |  |
Fixed interest rate | 4.75% |  |  |  |

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