Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 120,527	$ 110,122	$ 315,003	$ 319,318
Other comprehensive income/(loss), net of tax:
Changes in unrealized gains on available-for-sale securities	[1],[2]	19,123	16,344	22,467	58,428
Changes in unrealized gains/(losses) on cash flow hedging instruments	[3]	(2,968)	(477)	(651)	(4,260)
Foreign currency translation adjustment		7,946	(4,106)	(2,032)	(5,239)
Total other comprehensive income/(loss), net of tax		24,101	11,761	19,784	48,929
Comprehensive income		144,628	121,883	334,787	368,247
Net income applicable to non-controlling interests			708		1,612
Comprehensive income applicable to Stifel Financial Corp.		$ 144,628	$ 121,175	$ 334,787	$ 366,635

[1] As part of the adoption of ASU 2019-04, in the third quarter of 2019, the Company made a one-time election to transfer a portion of its held-to-maturity securities to available-for-sale. The transfer resulted in a net of tax increase to accumulated other comprehensive income of $17.9 million.

[2] There were no reclassifications to earnings for the three months ended September 30, 2020. Net of reclassifications to earnings of realized losses of $0.3 million for the nine months ended September 30, 2020. Reclassifications to earnings during the three months ended September 30, 2019 were immaterial. Net of reclassifications to earnings of realized losses of $0.2 million for the nine months ended September 30, 2019.

[3] Reclassifications to earnings were immaterial for the three and nine months ended September 30, 2020. Amounts are net of reclassifications to earnings of gains of $0.6 million and $2.9 million for the three and nine months ended September 30, 2019, respectively.