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Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities purchased under agreements to resell $ 451,056 $ 349,849
Held-to-maturity securities 5,792,946 5,852,176 [1]
Securities sold under agreements to repurchase 426,659 417,644
Federal Home Loan Bank advances 0  
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 3,406,515 3,357,095
Cash segregated for regulatory purposes 65,827 162,048
Securities purchased under agreements to resell 451,056 349,849
Held-to-maturity securities 5,792,946 5,852,176
Bank loans 17,981,705 18,259,923
Loans held for sale 534,593 423,999
Securities sold under agreements to repurchase 426,659 417,644
Bank deposits 25,540,594 25,326,174
Senior notes 1,073,265 1,041,217
Debentures to Stifel Financial Capital Trusts 57,520 55,507
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 3,406,515 3,357,095
Cash segregated for regulatory purposes 65,827 162,048
Securities purchased under agreements to resell 0 0
Held-to-maturity securities 0 0
Bank loans 0 0
Loans held for sale 0 0
Securities sold under agreements to repurchase 0 0
Bank deposits 0 0
Senior notes 1,073,265 1,041,217
Debentures to Stifel Financial Capital Trusts 0 0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 0 0
Cash segregated for regulatory purposes 0 0
Securities purchased under agreements to resell 451,056 349,849
Held-to-maturity securities 5,698,716 5,758,130
Bank loans 17,981,705 18,259,923
Loans held for sale 534,593 423,999
Securities sold under agreements to repurchase 426,659 417,644
Bank deposits 25,540,594 25,326,174
Senior notes 0 0
Debentures to Stifel Financial Capital Trusts 0 0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 0 0
Cash segregated for regulatory purposes 0 0
Securities purchased under agreements to resell 0 0
Held-to-maturity securities 94,230 94,046
Bank loans 0 0
Loans held for sale 0 0
Securities sold under agreements to repurchase 0 0
Bank deposits 0 0
Senior notes 0 0
Debentures to Stifel Financial Capital Trusts $ 57,520 $ 55,507
[1] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.