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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, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities purchased under agreements to resell $ 525,621 $ 528,976
Held-to-maturity securities [1] 6,477,018 6,547,647
Securities sold under agreements to repurchase 747,301 580,170
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 3,183,309 2,646,376
Cash segregated for regulatory purposes 31,851 29,895
Securities purchased under agreements to resell 525,621 528,976
Held-to-maturity securities 6,477,018 6,547,647
Bank loans 20,571,051 20,229,458
Loans held for sale 595,517 578,980
Securities sold under agreements to repurchase 747,301 580,170
Bank deposits 30,137,781 27,164,580
Senior notes 580,856 561,851
Debentures to Stifel Financial Capital Trusts 52,925 58,788
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 3,183,309 2,646,376
Cash segregated for regulatory purposes 31,851 29,895
Senior notes 580,856 561,851
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 525,621 528,976
Held-to-maturity securities 6,407,209 6,474,140
Bank loans 20,457,654 20,104,756
Loans held for sale 378,322 578,980
Securities sold under agreements to repurchase 747,301 580,170
Bank deposits 30,137,781 27,164,580
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 69,809 73,507
Bank loans 113,397 124,702
Loans held for sale 217,195  
Debentures to Stifel Financial Capital Trusts $ 52,925 $ 58,788
[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.