Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest revenue [Abstract]
Loans	$ 204,015	$ 193,841	$ 382,388	$ 391,415
Residential mortgage loans held for sale	1,559	1,569	2,953	2,949
Trading securities	22,958	36,655	63,933	72,577
Investment securities	3,485	2,608	5,839	5,334
Available for sale securities	58,672	58,909	116,604	117,517
Fair value option securities	437	402	928	898
Restricted equity securities	1,384	1,751	2,491	3,110
Interest-bearing cash and cash equivalents	1,737	158	2,210	332
Total interest revenue	294,247	295,893	577,346	594,132
Interest expense [Abstract]
Deposits	13,862	8,425	21,460	18,275
Borrowed funds	4,894	3,806	10,682	8,428
Subordinated debentures	1,473	3,353	2,775	6,700
Total interest expense	20,229	15,584	34,917	33,403
Net interest revenue	274,018	280,309	542,429	560,729
Provision for credit losses	0	(35,000)	0	(60,000)
Net interest revenue after provision for credit losses	274,018	315,309	542,429	620,729
Total fees and commissions	173,373	169,415	271,008	331,567
Other gains (losses), net	(7,639)	16,449	(9,283)	26,570
Gain (loss) on derivatives, net	(13,569)	18,820	(60,550)	(8,830)
Loss on fair value option securities, net	(2,221)	(1,627)	(13,422)	(3,537)
Change in fair value of mortgage servicing rights	17,485	(13,041)	66,595	20,833
Gain on available for sale securities, net	1,188	1,430	2,125	1,897
Total other operating revenue	168,617	191,446	256,473	368,500
Other operating expense [Abstract]
Personnel	154,923	172,035	314,151	345,045
Business promotion	6,325	2,744	12,838	4,898
Charitable contributions to BOKF Foundation	0	0	0	4,000
Professional fees and services	12,475	12,361	23,888	24,341
Net occupancy and equipment	27,489	26,633	58,344	53,295
Insurance	4,728	3,660	9,011	8,280
Data processing and communications	41,280	36,418	81,116	73,885
Printing, postage and supplies	3,929	4,285	7,618	7,725
Amortization of intangible assets	4,049	4,578	8,013	9,385
Mortgage banking costs	9,437	11,126	17,314	25,069
Other expense	9,020	17,312	18,980	31,013
Total other operating expense	273,655	291,152	551,273	586,936
Net income before taxes	168,980	215,603	247,629	402,293
Federal and state income taxes	36,122	48,496	52,319	90,878
Net income	132,858	167,107	195,310	311,415
Net loss attributable to non-controlling interests	12	686	(24)	(1,066)
Net income attributable to BOK Financial Corporation shareholders	$ 132,846	$ 166,421	$ 195,334	$ 312,481
Dividends declared per share	$ 0.53	$ 0.52	$ 1.06	$ 1.04
Earnings Per Share [Abstract]
Basic	1.96	2.40	2.87	4.50
Diluted	$ 1.96	$ 2.40	$ 2.87	$ 4.50
Average shares used in computation: [Abstract]
Basic	67,453,748	68,815,666	67,616,396	68,975,743
Diluted	67,455,172	68,817,442	67,617,834	68,978,798
Brokerage and trading revenue [Member]
Total fees and commissions	$ 44,043	$ 29,408	$ 16,964	$ 50,190
Transaction card revenue [Member]
Total fees and commissions	26,940	24,923	51,156	47,353
Fiduciary and asset management revenue [Member]
Total fees and commissions	49,838	44,832	96,237	86,154
Deposit service charges and fees [Member]
Total fees and commissions	28,500	25,861	55,504	50,070
Mortgage banking revenue [Member]
Total fees and commissions	11,368	21,219	28,018	58,332
Other revenue [Member]
Total fees and commissions	$ 12,684	$ 23,172	$ 23,129	$ 39,468