Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2022		Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020	[1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities purchased under agreements to resell	$ 541,840			$ 579,866
Held-to-maturity securities	5,665,534	[1]		5,343,481	$ 5,343,481
Securities sold under agreements to repurchase	257,759			385,528
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	1,413,242			1,960,322
Cash segregated for regulatory purposes	31,869			186,331
Securities purchased under agreements to resell	541,840			579,866
Held-to-maturity securities	5,665,534			5,343,481
Bank loans	20,229,657			16,704,912
Loans held for sale	234,927			207,715
Securities sold under agreements to repurchase	257,759			385,528
Bank deposits	24,638,897			22,998,842
Senior notes	1,040,587			1,218,344
Debentures to Stifel Financial Capital Trusts	54,771			46,340
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	1,413,242			1,960,322
Cash segregated for regulatory purposes	31,869			186,331
Securities purchased under agreements to resell	392,539			371,797
Securities sold under agreements to repurchase	12,090			10,000
Senior notes	1,040,587			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	149,301			208,069
Held-to-maturity securities	5,556,992			5,205,085
Bank loans	20,229,657			16,704,912
Loans held for sale	234,927			207,715
Securities sold under agreements to repurchase	245,669			375,528
Bank deposits	$ 24,638,897			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			$ 108,542	138,396
Debentures to Stifel Financial Capital Trusts			$ 54,771	$ 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.