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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
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                      
Net income applicable to Stifel Financial Corp. $ 130,690 $ 109,414 $ 109,085 $ 99,207 $ 114,062 $ 103,858 $ 87,287 $ 88,761 $ 448,396 $ 393,968 $ 182,871
Preferred dividends 4,843 4,844 5,288 2,344 2,344 2,343 2,344 2,344 17,319 9,375 9,375
Net income available to common shareholders $ 125,847 $ 104,570 $ 103,797 $ 96,863 $ 111,718 $ 101,515 $ 84,943 $ 86,417 $ 431,077 $ 384,593 $ 173,496
Average shares used in basic computation 70,470 71,197 72,519 71,700 71,666 71,919 71,692 71,999 71,998 71,786 68,562
Dilutive effect of stock options and units                 6,587 9,535 12,473
Average shares used in diluted computation 77,813 78,144 79,079 79,210 80,706 81,484 81,299 81,789 78,585 81,321 81,035
Basic $ 1.79 $ 1.47 $ 1.43 $ 1.35 $ 1.56 $ 1.41 $ 1.18 $ 1.20 $ 5.99 $ 5.36 $ 2.53
Diluted $ 1.62 $ 1.34 $ 1.31 $ 1.22 $ 1.38 $ 1.25 $ 1.04 $ 1.06 $ 5.49 $ 4.73 $ 2.14