Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Revenue from contracts with customers		$ 585,587	$ 532,144	$ 1,661,442	$ 1,605,149
Principal transactions		97,847	83,152	298,343	269,918
Interest		178,784	169,760	557,795	461,915
Other income		8,747	6,127	34,461	18,557
Total revenues		865,716	786,810	2,539,262	2,343,632
Interest expense		44,144	48,468	146,483	112,200
Net revenues	[1]	821,572	738,342	2,392,779	2,231,432
Non-interest expenses:
Compensation and benefits		486,160	422,324	1,411,135	1,322,387
Occupancy and equipment rental		58,649	54,035	178,566	165,226
Communications and office supplies		36,817	33,330	107,583	103,468
Commissions and floor brokerage		10,542	11,338	32,506	30,798
Other operating expenses		78,650	76,785	226,444	231,122
Total non-interest expenses		670,818	597,812	1,956,234	1,853,001
Income from operations before income tax expense		150,754	140,530	436,545	378,431
Provision for income taxes		40,632	36,672	117,227	98,525
Net income		110,122	103,858	319,318	279,906
Net income applicable to non-controlling interests		708		1,612
Net income applicable to Stifel Financial Corp.		109,414	103,858	317,706	279,906
Preferred dividends		4,844	2,343	12,476	7,031
Net income available to common shareholders		$ 104,570	$ 101,515	$ 305,230	$ 272,875
Earnings per common share:
Basic		$ 1.47	$ 1.41	$ 4.21	$ 3.80
Diluted		1.34	1.25	3.87	3.35
Cash dividends declared per common share		$ 0.15	$ 0.12	$ 0.45	$ 0.36
Weighted-average number of common shares outstanding:
Basic		71,197	71,919	72,512	71,824
Diluted		78,144	81,484	78,826	81,425
Commissions [Member]
Revenues:
Revenue from contracts with customers		$ 163,920	$ 158,016	$ 484,350	$ 490,693
Investment Banking [Member]
Revenues:
Revenue from contracts with customers		198,790	169,012	540,247	506,437
Asset Management and Service Fees [Member]
Revenues:
Revenue from contracts with customers		$ 217,628	$ 200,743	$ 624,066	$ 596,112

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