Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest revenue [Abstract]
Loans	$ 425,662	$ 264,350	$ 1,192,714	$ 646,738
Residential mortgage loans held for sale	1,234	1,684	3,305	4,637
Trading securities	65,221	22,720	147,051	86,653
Investment securities	8,276	9,108	25,790	14,947
Available for sale securities	99,124	58,779	282,449	175,383
Fair value option securities	552	286	7,561	1,214
Restricted equity securities	8,776	2,703	21,013	5,194
Interest-bearing cash and cash equivalents	8,199	3,520	24,257	5,730
Total interest revenue	617,044	363,150	1,704,140	940,496
Interest expense [Abstract]
Deposits	184,808	34,715	416,748	56,175
Borrowed funds	129,019	10,433	305,278	21,115
Subordinated debentures	2,321	1,677	6,609	4,452
Total interest expense	316,148	46,825	728,635	81,742
Net interest revenue	300,896	316,325	975,505	858,754
Provision for credit losses	7,000	15,000	40,000	15,000
Net interest revenue after provision for credit losses	293,896	301,325	935,505	843,754
Total fees and commissions	197,852	192,634	584,328	463,642
Other gains (losses), net	1,474	979	16,343	(8,304)
Loss on derivatives, net	(9,010)	(17,009)	(18,513)	(77,559)
Loss on fair value option securities, net	(203)	(4,368)	(5,323)	(17,790)
Change in fair value of mortgage servicing rights	8,039	16,570	11,241	83,165
Gain (loss) on available for sale securities, net	0	892	(3,010)	3,017
Total other operating revenue	198,152	189,698	585,066	446,171
Other operating expense [Abstract]
Personnel	190,791	170,348	563,588	484,499
Business promotion	6,958	6,127	23,167	18,965
Charitable contributions to BOKF Foundation	23	0	1,165	0
Professional fees and services	13,224	14,089	39,049	37,977
Net occupancy and equipment	32,583	29,296	91,147	87,640
Insurance	7,996	4,306	22,285	13,317
Data processing and communications	45,672	41,743	135,781	122,859
Printing, postage and supplies	3,760	4,349	11,381	11,967
Amortization of intangible assets	3,474	3,943	10,339	11,956
Mortgage banking costs	8,357	9,504	22,439	26,818
Other expense	11,475	11,046	28,457	30,026
Total other operating expense	324,313	294,751	948,798	846,024
Net income before taxes	167,735	196,272	571,773	443,901
Federal and state income taxes	33,256	39,681	123,162	92,000
Net income	134,479	156,591	448,611	351,901
Net income (loss) attributable to non-controlling interests	(16)	81	440	57
Net income attributable to BOK Financial Corporation shareholders	$ 134,495	$ 156,510	$ 448,171	$ 351,844
Earnings Per Share [Abstract]
Basic	$ 2.04	$ 2.32	$ 6.74	$ 5.18
Diluted	$ 2.04	$ 2.32	$ 6.74	$ 5.18
Average shares used in computation: [Abstract]
Basic	65,548,307	67,003,199	65,955,294	67,409,789
Diluted	65,548,307	67,004,623	65,955,294	67,411,222
Dividends declared per share	$ 0.54	$ 0.53	$ 1.62	$ 1.59
Brokerage and trading revenue [Member]
Total fees and commissions	$ 62,312	$ 61,006	$ 179,714	$ 77,970
Transaction card revenue [Member]
Total fees and commissions	26,387	25,974	78,011	77,130
Fiduciary and asset management revenue [Member]
Total fees and commissions	52,256	50,190	155,910	146,427
Deposit service charges and fees [Member]
Total fees and commissions	27,676	28,703	80,744	84,207
Mortgage banking revenue [Member]
Total fees and commissions	13,356	11,282	42,864	39,300
Other revenue [Member]
Total fees and commissions	$ 15,865	$ 15,479	$ 47,085	$ 38,608