v3.26.1
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
Jun. 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] $ 798,907 $ 564,162
Held-to-maturity securities [2] 6,895,122 6,565,484
Securities sold under agreements to repurchase [3] 1,095,619 651,236
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 2,188,460 2,251,449
Cash segregated for regulatory purposes 30,068 29,018
Securities purchased under agreements to resell 798,907 564,162
Held-to-maturity securities 6,895,122 6,565,484
Bank loans 24,251,223 21,610,180
Loans held for sale 373,591 502,199
Securities sold under agreements to repurchase 1,095,619 651,236
Bank deposits 32,263,766 29,752,095
Federal Home Loan Bank advances 450,000  
Senior notes 563,264 576,180
Debentures to Stifel Financial Capital Trusts 50,493 51,582
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 2,188,460 2,251,449
Cash segregated for regulatory purposes 30,068 29,018
Federal Home Loan Bank advances 450,000  
Senior notes 563,264 576,180
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 798,907 564,162
Held-to-maturity securities 6,827,323 6,495,393
Bank loans 24,167,955 21,515,785
Loans held for sale 373,591 502,199
Securities sold under agreements to repurchase 1,095,619 651,236
Bank deposits 32,263,766 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 67,799 70,091
Bank loans 83,268 94,395
Debentures to Stifel Financial Capital Trusts $ 50,493 $ 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 $794.0 million and $561.3 million at June 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 $1.0 billion and $687.2 million at June 30, 2026 and December 31, 2025, respectively.