Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities purchased under agreements to resell		$ 348,162	$ 579,866
Held-to-maturity securities	[1]	5,738,418	5,343,481
Securities sold under agreements to repurchase		212,011	385,528
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash		2,198,335	1,960,322
Cash segregated for regulatory purposes		29,017	186,331
Securities purchased under agreements to resell		348,162	579,866
Held-to-maturity securities		5,738,418	5,343,481
Bank loans		19,752,043	16,704,912
Loans held for sale		156,912	207,715
Securities sold under agreements to repurchase		212,011	385,528
Bank deposits		24,274,224	22,998,842
Senior notes		1,016,755	1,218,344
Debentures to Stifel Financial Capital Trusts		53,385	46,340
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash		2,198,335	1,960,322
Cash segregated for regulatory purposes		29,017	186,331
Securities purchased under agreements to resell		218,515	371,797
Securities sold under agreements to repurchase			10,000
Senior notes		1,016,755	1,218,344
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		129,647	208,069
Held-to-maturity securities		5,624,042	5,205,085
Bank loans		19,752,043	16,704,912
Loans held for sale		156,912	207,715
Securities sold under agreements to repurchase		212,011	375,528
Bank deposits		24,274,224	22,998,842
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		114,376	138,396
Debentures to Stifel Financial Capital Trusts		$ 53,385	$ 46,340

[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.