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Subordinated Debentures (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 141,179 | $ 118,156
Debt issuance costs | (907) | (1,005)
Total junior subordinated debentures |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | 92,086 | 69,161
Total junior subordinated debentures | EFSC Clayco Statutory Trust I |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 3,196 | 3,196
Maturity Date | Dec. 17, 2033 |
Call Date | Dec. 17, 2008 |
Total junior subordinated debentures | EFSC Clayco Statutory Trust I | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0285 |
Total junior subordinated debentures | EFSC Capital Trust II |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 5,155 | 5,155
Maturity Date | Jun. 17, 2034 |
Call Date | Jun. 17, 2009 |
Total junior subordinated debentures | EFSC Capital Trust II | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0265 |
Total junior subordinated debentures | EFSC Statutory Trust III |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 11,341 | 11,341
Maturity Date | Dec. 15, 2034 |
Call Date | Dec. 15, 2009 |
Total junior subordinated debentures | EFSC Statutory Trust III | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0197 |
Total junior subordinated debentures | EFSC Clayco Statutory Trust II |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 4,124 | 4,124
Maturity Date | Sep. 15, 2035 |
Call Date | Sep. 15, 2010 |
Total junior subordinated debentures | EFSC Clayco Statutory Trust II | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0183 |
Total junior subordinated debentures | EFSC Statutory Trust IV |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 10,310 | 10,310
Maturity Date | Dec. 15, 2035 |
Call Date | Dec. 15, 2010 |
Total junior subordinated debentures | EFSC Statutory Trust IV | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0144 |
Total junior subordinated debentures | EFSC Statutory Trust V |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 4,124 | 4,124
Maturity Date | Sep. 15, 2036 |
Call Date | Sep. 15, 2011 |
Total junior subordinated debentures | EFSC Statutory Trust V | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.016 |
Total junior subordinated debentures | EFSC Capital Trust VI |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 14,433 | 14,433
Maturity Date | Mar. 30, 2037 |
Call Date | Mar. 30, 2012 |
Total junior subordinated debentures | EFSC Capital Trust VI | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.016 |
Total junior subordinated debentures | EFSC Capital Trust VII |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 4,124 | 4,124
Maturity Date | Dec. 15, 2037 |
Call Date | Dec. 15, 2012 |
Total junior subordinated debentures | EFSC Capital Trust VII | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0225 |
Total junior subordinated debentures | JEFFCO Stat Trust I |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 7,920 | 8,019
Maturity Date | Feb. 22, 2031 |
Call Date | Feb. 22, 2011 |
Fixed interest rate | 10.20% |
Total junior subordinated debentures | JEFFCO Stat Trust II |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 4,375 | 4,335
Maturity Date | Mar. 17, 2034 |
Call Date | Mar. 17, 2009 |
Total junior subordinated debentures | JEFFCO Stat Trust II | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Fixed interest rate | 2.75% |
Total junior subordinated debentures | Trinity Capital Trust III |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 5,189 | 0
Maturity Date | Sep. 08, 2034 |
Call Date | Sep. 08, 2009 |
Total junior subordinated debentures | Trinity Capital Trust III | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.027 |
Total junior subordinated debentures | Trinity Capital Trust IV |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 10,293 | 0
Maturity Date | Nov. 23, 2035 |
Call Date | Aug. 23, 2010 |
Fixed interest rate | 6.88% |
Total junior subordinated debentures | Trinity Capital Trust V |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 7,502 | 0
Maturity Date | Dec. 15, 2036 |
Call Date | Sep. 15, 2011 |
Total junior subordinated debentures | Trinity Capital Trust V | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.0165 |
Subordinated notes |  |
Subordinated Borrowing [Line Items] |  |
Subordinated debentures and notes (net of debt issuance cost of $907 and $1,005, respectively) | $ 50,000 | 50,000
Debt issuance costs | (907) | (1,005)
Total fixed-to-floating rate subordinated notes | $ 49,093 | $ 48,995
Maturity Date | Nov. 01, 2026 |
Call Date | Nov. 01, 2021 |
Fixed interest rate | 4.75% |
Subordinated notes | 3 Month LIBOR |  |
Subordinated Borrowing [Line Items] |  |
Floating interest rate | 0.03387 |
Junior subordinated debentures |  |
Subordinated Borrowing [Line Items] |  |
Par value | $ 26,800 |
Preliminary fair value | $ 22,800 |

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