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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%