Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenue from contracts with customers		$ 559,517	$ 531,349	$ 1,075,855	$ 1,073,005
Principal transactions		96,464	88,984	200,496	186,766
Interest		187,940	154,421	379,011	292,155
Other income		13,505	9,073	25,714	12,430
Total revenues		853,678	780,011	1,673,546	1,556,822
Interest expense		52,891	37,279	102,339	63,732
Net revenues	[1]	800,787	742,732	1,571,207	1,493,090
Non-interest expenses
Compensation and benefits		466,861	442,170	924,975	900,063
Occupancy and equipment rental		61,055	53,596	119,917	111,191
Communications and office supplies		35,069	36,639	70,766	70,138
Commissions and floor brokerage		11,008	10,095	21,964	19,460
Other operating expenses		78,812	81,885	147,794	154,337
Total non-interest expenses		652,805	624,385	1,285,416	1,255,189
Income from operations before income tax expense		147,982	118,347	285,791	237,901
Provision for income taxes		38,225	31,060	76,595	61,853
Net income		109,757	87,287	209,196	176,048
Net income applicable to non-controlling interests		672		904
Net income applicable to Stifel Financial Corp.		109,085	87,287	208,292	176,048
Preferred dividends		5,288	2,344	7,632	4,688
Net income available to common shareholders		$ 103,797	$ 84,943	$ 200,660	$ 171,360
Earnings per common share
Basic		$ 1.43	$ 1.18	$ 2.74	$ 2.39
Diluted		1.31	1.04	2.53	2.10
Cash dividends declared per common share		$ 0.15	$ 0.12	$ 0.30	$ 0.24
Weighted-average number of common shares outstanding
Basic		72,519	71,692	73,180	71,843
Diluted		79,079	81,299	79,160	81,548
Commissions [Member]
Revenues
Revenue from contracts with customers		$ 164,981	$ 166,902	$ 320,430	$ 332,677
Investment Banking [Member]
Revenues
Revenue from contracts with customers		179,617	161,063	341,457	337,425
Asset Management and Service Fees [Member]
Revenues
Revenue from contracts with customers		$ 211,171	$ 199,568	$ 406,438	$ 395,369

[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2019 or 2018.