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Debt (Details)
 1 Months Ended 12 Months Ended
Sep. 02, 2025
USD ($)
paymentInstallment
Feb. 28, 2019
USD ($)
Feb. 27, 2026
Feb. 29, 2016
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
May 01, 2025
USD ($)
Subordinated Borrowing [Line Items]              
Number of Unconsolidated Statutory Business Trusts         13    
Investments trust preferred securities         $ 2,900,000    
Subordinated Debt         93,688,000 $ 156,551,000  
Securities Sold under Agreements to Repurchase         292,782,000 244,618,000  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss         11,800,338,000 11,220,355,000  
Loans Payable         58,732,000 0  
Des Moines              
Subordinated Borrowing [Line Items]              
Carrying value of the loans pledged         2,900,000,000 2,600,000,000  
Availability under the secured line of credit         1,600,000,000 1,300,000,000  
Various Other Borrowings              
Subordinated Borrowing [Line Items]              
Unsecured term loan, face amount         $ 36,200,000    
Convertible trust preferred securities, interest rate, stated percentage         1.00%    
Debt Instrument, Interest, Period         7 years    
Various Other Borrowings | Minimum              
Subordinated Borrowing [Line Items]              
Term (in years)         23 years    
Various Other Borrowings | Maximum              
Subordinated Borrowing [Line Items]              
Term (in years)         28 years    
5.75%              
Subordinated Borrowing [Line Items]              
Fixed interest rate         5.75%    
Trust preferred securities [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 93,688,000 93,404,000  
Trust preferred securities [Member] | EFSC Clayco Statutory Trust I [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 3,196,000 3,196,000  
Maturity Date         Dec. 17, 2033    
Initial Call Date (1)         Dec. 17, 2008    
Floating interest rate         0.0311    
Trust preferred securities [Member] | EFSC Capital Trust II [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 5,155,000 5,155,000  
Maturity Date         Jun. 17, 2034    
Initial Call Date (1)         Jun. 17, 2009    
Floating interest rate         0.0291    
Trust preferred securities [Member] | EFSC Statutory Trust III [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 11,341,000 11,341,000  
Maturity Date         Dec. 15, 2034    
Initial Call Date (1)         Dec. 15, 2009    
Floating interest rate         0.0223    
Trust preferred securities [Member] | EFSC Clayco Statutory Trust II [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 4,124,000 4,124,000  
Maturity Date         Sep. 15, 2035    
Initial Call Date (1)         Sep. 15, 2010    
Floating interest rate         0.0209    
Trust preferred securities [Member] | EFSC Statutory Trust IV [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 10,310,000 10,310,000  
Maturity Date         Dec. 15, 2035    
Initial Call Date (1)         Dec. 15, 2010    
Floating interest rate         0.0170    
Trust preferred securities [Member] | EFSC Statutory Trust V [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 4,124,000 4,124,000  
Maturity Date         Sep. 15, 2036    
Initial Call Date (1)         Sep. 15, 2011    
Floating interest rate         0.0186    
Trust preferred securities [Member] | EFSC Capital Trust VI [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 14,433,000 14,433,000  
Maturity Date         Mar. 30, 2037    
Initial Call Date (1)         Mar. 30, 2012    
Floating interest rate         0.0186    
Trust preferred securities [Member] | EFSC Capital Trust VII [Member]              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 4,124,000 4,124,000  
Maturity Date         Dec. 15, 2037    
Initial Call Date (1)         Dec. 15, 2012    
Floating interest rate         0.0251    
Trust preferred securities [Member] | JEFFCO Stat Trust I [Member]              
Subordinated Borrowing [Line Items]              
Fixed interest rate         10.20%    
Subordinated Debt         $ 7,732,000 7,732,000  
Maturity Date         Feb. 22, 2031    
Initial Call Date (1)         Feb. 22, 2011    
Trust preferred securities [Member] | JEFFCO Stat Trust II [Member]              
Subordinated Borrowing [Line Items]              
Fixed interest rate         3.01%    
Subordinated Debt         $ 4,712,000 4,658,000  
Maturity Date         Mar. 17, 2034    
Initial Call Date (1)         Mar. 17, 2009    
Trust preferred securities [Member] | Trinity Capital Trust III [Member]              
Subordinated Borrowing [Line Items]              
Fixed interest rate         2.96%    
Subordinated Debt         $ 5,606,000 5,539,000  
Maturity Date         Sep. 08, 2034    
Initial Call Date (1)         Sep. 08, 2009    
Trust preferred securities [Member] | Trinity Capital Trust IV [Member]              
Subordinated Borrowing [Line Items]              
Fixed interest rate         6.88%    
Subordinated Debt         $ 10,310,000 10,310,000  
Maturity Date         Nov. 23, 2035    
Initial Call Date (1)         Aug. 23, 2010    
Trust preferred securities [Member] | Trinity Capital Trust V [Member]              
Subordinated Borrowing [Line Items]              
Fixed interest rate         1.91%    
Subordinated Debt         $ 8,521,000 8,358,000  
Maturity Date         Dec. 15, 2036    
Initial Call Date (1)         Sep. 15, 2011    
Senior Subordinated Notes [Member]              
Subordinated Borrowing [Line Items]              
Debt issuance costs         $ 0 (103,000)  
Subordinated notes, net of issuance costs         $ 0 63,147,000  
Senior Subordinated Notes [Member] | Unsecured Term Loan Agreement ("Term Loan")              
Subordinated Borrowing [Line Items]              
Fixed interest rate         5.75%    
Subordinated Debt         $ 63,300,000    
Unsecured term loan, face amount $ 63,300,000            
Basis spread 2.50%            
Debt Instrument, Number Of Quarterly Installment Payments | paymentInstallment 20            
Senior Subordinated Notes [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Subordinated Borrowing [Line Items]              
Floating interest rate         0.0566    
Senior Subordinated Notes [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Unsecured Term Loan Agreement ("Term Loan")              
Subordinated Borrowing [Line Items]              
Floating interest rate         566    
Senior Subordinated Notes [Member] | 9.98% | Unsecured Term Loan Agreement ("Term Loan")              
Subordinated Borrowing [Line Items]              
Fixed interest rate         9.98%    
Senior Subordinated Notes [Member] | 5.75%              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 0 63,250,000  
Maturity Date         Jun. 01, 2030    
Initial Call Date (1)         Jun. 01, 2025    
Line of Credit              
Subordinated Borrowing [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding         $ 0 0  
Remaining borrowing capacity         3,000,000,000.0 2,800,000,000  
Line of Credit | Asset Pledged as Collateral without Right | Federal Home Loan Bank Advances              
Subordinated Borrowing [Line Items]              
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss         $ 3,500,000,000 $ 3,200,000,000  
Line of Credit | Senior Unsecured Revolving Credit Agreement ("Revolving Agreement") | Revolving Credit Facility              
Subordinated Borrowing [Line Items]              
Basis spread       1.85%      
Term (in years) 1 year            
Line of Credit, Current             $ 25,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.40%            
Line of Credit | Senior Unsecured Revolving Credit Agreement ("Revolving Agreement") | Revolving Credit Facility | Subsequent Event              
Subordinated Borrowing [Line Items]              
Term (in years)     1 year        
Line of Credit | 2019 Unsecured Term Loan | Secured Debt              
Subordinated Borrowing [Line Items]              
Unsecured term loan, face amount   $ 40,000,000.0          
Term (in years)   5 years          
Other Borrowings              
Subordinated Borrowing [Line Items]              
Debt Instrument, Interest Rate During Period         2.90% 3.44%  
Unsecured Term Loan              
Subordinated Borrowing [Line Items]              
Debt Instrument, Interest Rate During Period         6.68% 6.78%