v3.26.1
Fair Value Measurements (Schedule of Investments Measured at Fair Value on a Recurring Basis) (Details) - EBP 001 - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 2,406,607 $ 2,077,057
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,013,365 843,426
Stifel Financial Corp. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 219,784 188,099
Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 20,621 28,573
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,253,770 1,060,062
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,013,365 843,426
Level 1 | Stifel Financial Corp. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 219,784 188,099
Level 1 | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 20,621 28,537
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Stifel Financial Corp. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 36
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Stifel Financial Corp. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Self-directed brokerage accounts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 36
Level 1 2 and 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,253,770 1,060,098
Fair Value Measured at Net Asset Value Per Share | Pooled separate accounts measured at NAV    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 1,152,837 $ 1,016,959