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Fair Value Of Financial Instruments (Schedule of Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities purchased under agreements to resell $ 525,621 $ 528,976
Financial instruments owned 1,540,478 1,169,008
Available-for-sale securities 1,688,636 1,584,598
Held-to-maturity securities [1] 6,477,018 6,547,647
Securities sold under agreements to repurchase 747,301 580,170
Financial instruments sold, but not yet purchased, at fair value 806,120 646,271
Senior notes 617,236 616,618
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,184,905 2,648,308
Cash segregated for regulatory purposes 31,851 29,895
Securities purchased under agreements to resell 525,621 528,976
Financial instruments owned 1,540,478 1,169,008
Available-for-sale securities 1,688,636 1,584,598
Held-to-maturity securities 6,458,002 6,524,954
Bank loans 21,039,173 20,731,796
Loans held for sale 595,517 578,980
Investments 80,267 75,358
Derivative contracts, Assets [2] 76,114 110,814
Securities sold under agreements to repurchase 747,301 580,170
Bank deposits 30,137,748 29,102,227
Financial instruments sold, but not yet purchased, at fair value 806,120 646,271
Senior notes 617,236 616,618
Debentures to Stifel Financial Capital Trusts 55,000 60,000
Derivative contracts [3] 76,125 110,825
Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,184,905 2,648,308
Cash segregated for regulatory purposes 31,851 29,895
Securities purchased under agreements to resell 525,621 528,976
Financial instruments owned 1,540,478 1,169,008
Available-for-sale securities 1,688,636 1,584,598
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
Investments 80,267 75,358
Derivative contracts, Assets [2] 76,114 110,814
Securities sold under agreements to repurchase 747,301 580,170
Bank deposits 30,137,781 27,164,580
Financial instruments sold, but not yet purchased, at fair value 806,120 646,271
Senior notes 580,856 561,851
Debentures to Stifel Financial Capital Trusts 52,925 58,788
Derivative contracts [3] $ 76,125 $ 110,825
[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.
[2] Included in accounts payable and accrued expenses in the consolidated statements of financial condition.
[3] Included in other assets in the consolidated statements of financial condition.