Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenue from contracts with customers		$ 605,314	$ 559,517	$ 1,238,422	$ 1,075,855
Principal transactions		166,017	96,464	304,683	200,496
Interest		128,368	187,940	289,545	379,011
Other income		21,514	13,505	30,721	25,714
Total revenues		908,901	853,678	1,846,292	1,673,546
Interest expense		13,084	52,891	37,441	102,339
Net revenues	[1]	895,817	800,787	1,808,851	1,571,207
Non-interest expenses:
Compensation and benefits		547,174	466,861	1,124,353	924,975
Occupancy and equipment rental		66,264	61,055	132,337	119,917
Communications and office supplies		43,046	35,069	84,170	70,766
Commissions and floor brokerage		15,177	11,008	30,019	21,964
Provision for credit losses		19,210	2,353	35,278	4,636
Other operating expenses		61,986	76,459	144,628	143,158
Total non-interest expenses		752,857	652,805	1,550,785	1,285,416
Income from operations before income tax expense		142,960	147,982	258,066	285,791
Provision for income taxes		35,073	38,225	63,590	76,595
Net income		107,887	109,757	194,476	209,196
Net income applicable to non-controlling interests			672		904
Net income applicable to Stifel Financial Corp.		107,887	109,085	194,476	208,292
Preferred dividends		4,843	5,288	9,687	7,632
Net income available to common shareholders		$ 103,044	$ 103,797	$ 184,789	$ 200,660
Earnings per common share:
Basic		$ 1.46	$ 1.43	$ 2.61	$ 2.74
Diluted		1.39	1.31	2.44	2.53
Cash dividends declared per common share		$ 0.17	$ 0.15	$ 0.34	$ 0.30
Weighted-average number of common shares outstanding:
Basic		70,527	72,519	70,905	73,180
Diluted		74,387	79,079	75,651	79,160
Commissions [Member]
Revenues:
Revenue from contracts with customers		$ 177,028	$ 164,981	$ 388,126	$ 320,430
Investment Banking [Member]
Revenues:
Revenue from contracts with customers		217,035	179,617	396,503	341,457
Asset Management and Service Fees [Member]
Revenues:
Revenue from contracts with customers		$ 198,939	$ 211,171	$ 436,714	$ 406,438

[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2020 or 2019.