v3.26.3
Fair Value Of Financial Instruments (Estimated Fair Values and Fair Value Hierarchy of Financial Instruments not Recorded or Measured at Fair Value on a Nonrecurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities purchased under agreements to resell [1] $ 821,323 $ 564,162
Held-to-maturity securities [2] 6,517,708 6,565,484
Securities sold under agreements to repurchase [3] 817,198 651,236
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 1,626,217 2,251,449
Cash segregated for regulatory purposes 32,441 29,018
Securities purchased under agreements to resell 821,323 564,162
Held-to-maturity securities 6,517,708 6,565,484
Bank loans 25,395,573 21,610,180
Loans held for sale 328,900 502,199
Securities sold under agreements to repurchase 817,198 651,236
Bank deposits 32,807,067 29,752,095
Senior notes 545,046 576,180
Debentures to Stifel Financial Capital Trusts 51,123 51,582
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 1,626,217 2,251,449
Cash segregated for regulatory purposes 32,441 29,018
Senior notes 545,046 576,180
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities purchased under agreements to resell 821,323 564,162
Held-to-maturity securities 6,509,624 6,495,393
Bank loans 25,307,357 21,515,785
Loans held for sale 328,900 502,199
Securities sold under agreements to repurchase 817,198 651,236
Bank deposits 32,807,067 29,752,095
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity securities 8,084 70,091
Bank loans 88,216 94,395
Debentures to Stifel Financial Capital Trusts $ 51,123 $ 51,582
[1] Available collateral includes securities received from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities received as collateral was $815.2 million and $561.3 million at September 30, 2026 and December 31, 2025, respectively.
[2] 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.
[3] Collateral pledged includes the fair value of securities pledged to the counterparty. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counterparty includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $687.8 million and $687.2 million at September 30, 2026 and December 31, 2025, respectively.