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Quarterly Financial Information (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 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 808,612 | $ 686,932 | $ 665,738 | $ 628,797 | $ 666,791 | $ 617,050 | $ 625,590 | $ 639,077 |  |  |  |  |  |  |
Interest income | 167,087 | 178,784 | 187,940 | 191,071 | 184,534 | 169,760 | 154,421 | 137,734 | $ 724,882 |  | $ 646,449 |  | $ 454,381 |  |
Total revenues | 975,699 | 865,716 | 853,678 | 819,868 | 851,325 | 786,810 | 780,011 | 776,811 | 3,514,961 |  | 3,194,957 |  | 2,996,462 |  |
Interest expense | 31,448 | 44,144 | 52,891 | 49,448 | 57,876 | 48,468 | 37,279 | 26,453 | 177,931 |  | 170,076 |  | 70,030 |  |
Net revenues | 944,251 | 821,572 | 800,787 | 770,420 | 793,449 | 738,342 | 742,732 | 750,358 | 3,337,030 | [1] | 3,024,881 | [1] | 2,926,432 | [1] |
Total non-interest expenses | 781,658 | 670,818 | 652,805 | 632,611 | 637,518 | 597,812 | 624,385 | 630,804 | 2,737,892 |  | 2,490,519 |  | 2,656,896 |  |
Income before income tax expense | 162,593 | 150,754 | 147,982 | 137,809 | 155,931 | 140,530 | 118,347 | 119,554 | 599,138 |  | 534,362 |  | 269,536 |  |
Provision for income taxes | 31,925 | 40,632 | 38,225 | 38,370 | 41,869 | 36,672 | 31,060 | 30,793 | 149,152 |  | 140,394 |  | 86,665 |  |
Net income | 130,668 | 110,122 | 109,757 | 99,439 |  |  |  |  | 449,986 |  | 393,968 |  | 182,871 |  |
Net income applicable to non-controlling interests | (22) | 708 | 672 | 232 |  |  |  |  | 1,590 |  |  |  |  |  |
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 |  |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Cash dividends declared per common share | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.60 |  | $ 0.48 |  | $ 0.20 |  | $ 0.20
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 70,470 | 71,197 | 72,519 | 71,700 | 71,666 | 71,919 | 71,692 | 71,999 | 71,998 |  | 71,786 |  | 68,562 |  |
Diluted | 77,813 | 78,144 | 79,079 | 79,210 | 80,706 | 81,484 | 81,299 | 81,789 | 78,585 |  | 81,321 |  | 81,035 |  |
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2019, 2018, and 2017.

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