CONSOLIDATED INCOME STATEMENTS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
REVENUE
Commissions	$ 349,248	$ 370,382	$ 401,607
Advisory fees	415,679	425,615	451,197
Investment banking	117,665	127,529	435,870
Bank deposit sweep income	172,807	104,558	15,557
Interest	104,550	60,713	36,482
Principal transactions, net	65,347	21,031	23,984
Other	23,529	1,113	29,338
Total revenue	1,248,825	1,110,941	1,394,035
EXPENSES
Compensation and related expenses	782,396	740,827	886,840
Communications and technology	91,321	85,474	80,520
Occupancy and equipment costs	66,002	59,897	60,069
Clearing and exchange fees	24,928	25,566	22,306
Interest	68,599	23,846	9,855
Other	168,809	129,777	109,804
Total expenses	1,202,055	1,065,387	1,169,394
Pre-tax income	46,770	45,554	224,641
Income tax provision	16,498	13,444	65,677
Net income	30,272	32,110	158,964
Net income (loss) attributable to non-controlling interests, net of tax	93	(241)	0
Net income attributable to Oppenheimer Holdings Inc.	$ 30,179	$ 32,351	$ 158,964
Earnings per share attributable to Oppenheimer Holdings Inc.
Basic (in dollars per share)	$ 2.81	$ 2.77	$ 12.57
Diluted (in dollars per share)	$ 2.59	$ 2.57	$ 11.70
Weighted average shares outstanding
Basic (in shares)	10,736,166	11,666,194	12,642,306
Diluted (in shares)	11,645,708	12,607,752	13,582,828
Period end shares outstanding (in shares)	10,286,448	10,968,221	12,546,701