CONDENSED CONSOLIDATED INCOME STATEMENTS (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
REVENUE
Commissions	$ 88,544	$ 94,378	$ 175,241	$ 192,699
Advisory fees	101,015	107,405	201,559	223,171
Investment banking	19,978	16,653	57,943	55,123
Bank deposit sweep income	44,060	14,845	92,969	19,199
Interest	27,320	11,789	52,261	21,306
Principal transactions, net	16,253	1,258	29,743	3,622
Other	9,019	(9,106)	18,152	(11,870)
Total revenue	306,189	237,222	627,868	503,250
EXPENSES
Compensation and related expenses	187,224	177,979	393,516	364,010
Communications and technology	22,783	20,896	45,223	42,481
Occupancy and equipment costs	16,440	14,554	32,341	29,244
Clearing and exchange fees	5,927	6,242	12,190	12,218
Interest	17,467	3,628	30,609	6,140
Other	68,047	20,092	106,639	41,113
Total expenses	317,888	243,391	620,518	495,206
Pre-tax income (loss)	(11,699)	(6,169)	7,350	8,044
Income taxes provision (benefit)	(2,131)	(1,449)	2,454	2,986
Net income (loss)	(9,568)	(4,720)	4,896	5,058
Net loss attributable to noncontrolling interest, net of tax	(168)	(846)	(321)	(360)
Net income (loss) attributable to Oppenheimer Holdings Inc.	$ (9,400)	$ (3,874)	$ 5,217	$ 5,418
Earnings (loss) per share attributable to Oppenheimer Holdings Inc.
Basic (in dollars per share)	$ (0.85)	$ (0.32)	$ 0.47	$ 0.44
Diluted (in dollars per share)	$ (0.85)	$ (0.32)	$ 0.44	$ 0.41
Weighted average shares outstanding
Basic (in shares)	11,016,430	11,980,115	11,054,306	12,222,527
Diluted (in shares)	11,016,430	11,980,115	11,911,379	13,141,538
Period end shares outstanding (in shares)	10,984,240	11,370,609	10,984,240	11,370,609