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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income applicable to Stifel Financial Corp. $ 824,858 $ 503,472 $ 448,396
Preferred dividends 35,587 27,261 17,319
Net income available to common shareholders $ 789,271 $ 476,211 $ 431,077
Average shares used in basic computation 107,536 106,174 107,997
Dilutive effect of stock options and units [1] 10,994 8,399 9,881
Average shares used in diluted computation 118,530 114,573 117,878
Basic $ 7.34 $ 4.49 $ 3.99
Diluted $ 6.66 $ 4.16 $ 3.66
[1] Diluted earnings per share is computed on the basis of the weighted-average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include units.