Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest revenue [Abstract]
Loans	$ 264,350	$ 191,206	$ 646,738	$ 582,621
Residential mortgage loans held for sale	1,684	1,274	4,637	4,223
Trading securities	22,720	38,941	86,653	111,518
Investment securities	9,108	2,580	14,947	7,914
Available for sale securities	58,779	57,310	175,383	174,827
Fair value option securities	286	342	1,214	1,240
Restricted equity securities	2,703	1,565	5,194	4,675
Interest-bearing cash and cash equivalents	3,520	245	5,730	577
Total interest revenue	363,150	293,463	940,496	887,595
Interest expense [Abstract]
Deposits	34,715	7,665	56,175	25,940
Borrowed funds	10,433	3,066	21,115	11,494
Subordinated debentures	1,677	2,505	4,452	9,205
Total interest expense	46,825	13,236	81,742	46,639
Net interest revenue	316,325	280,227	858,754	840,956
Provision for credit losses	15,000	(23,000)	15,000	(83,000)
Net interest revenue after provision for credit losses	301,325	303,227	843,754	923,956
Total fees and commissions	192,634	190,421	463,642	521,988
Other gains (losses), net	979	31,091	(8,304)	57,661
Loss on derivatives, net	(17,009)	(5,760)	(77,559)	(14,590)
Loss on fair value option securities, net	(4,368)	(120)	(17,790)	(3,657)
Change in fair value of mortgage servicing rights	16,570	12,945	83,165	33,778
Gain on available for sale securities, net	892	1,255	3,017	3,152
Total other operating revenue	189,698	229,832	446,171	598,332
Other operating expense [Abstract]
Personnel	170,348	175,863	484,499	520,908
Business promotion	6,127	4,939	18,965	9,837
Charitable contributions to BOKF Foundation	0	0	0	4,000
Professional fees and services	14,089	12,436	37,977	36,777
Net occupancy and equipment	29,296	28,395	87,640	81,690
Insurance	4,306	3,712	13,317	11,992
Data processing and communications	41,743	38,371	122,859	112,256
Printing, postage and supplies	4,349	3,558	11,967	11,283
Amortization of intangible assets	3,943	4,488	11,956	13,873
Mortgage banking costs	9,504	8,962	26,818	34,031
Other expense	11,046	10,553	30,026	41,566
Total other operating expense	294,751	291,277	846,024	878,213
Net income before taxes	196,272	241,782	443,901	644,075
Federal and state income taxes	39,681	54,061	92,000	144,939
Net income	156,591	187,721	351,901	499,136
Net income (loss) attributable to non-controlling interests	81	(601)	57	(1,667)
Net income attributable to BOK Financial Corporation shareholders	$ 156,510	$ 188,322	$ 351,844	$ 500,803
Earnings Per Share [Abstract]
Basic	$ 2.32	$ 2.74	$ 5.18	$ 7.23
Diluted	$ 2.32	$ 2.74	$ 5.18	$ 7.23
Average shares used in computation: [Abstract]
Basic	67,003,199	68,359,125	67,409,789	68,768,044
Diluted	67,004,623	68,360,871	67,411,222	68,770,663
Dividends declared per share	$ 0.53	$ 0.52	$ 1.59	$ 1.56
Brokerage and trading revenue [Member]
Total fees and commissions	$ 61,006	$ 47,930	$ 77,970	$ 98,120
Transaction card revenue [Member]
Total fees and commissions	25,974	24,632	77,130	71,985
Fiduciary and asset management revenue [Member]
Total fees and commissions	50,190	45,248	146,427	131,402
Deposit service charges and fees [Member]
Total fees and commissions	28,703	27,429	84,207	77,499
Mortgage banking revenue [Member]
Total fees and commissions	11,282	26,286	39,300	84,618
Other revenue [Member]
Total fees and commissions	$ 15,479	$ 18,896	$ 38,608	$ 58,364