Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest revenue [Abstract]
Loans	$ 399,182	$ 204,015	$ 767,052	$ 382,388
Residential mortgage loans held for sale	1,092	1,559	2,071	2,953
Trading securities	47,821	22,958	81,830	63,933
Investment securities	8,586	3,485	17,514	5,839
Available for sale securities	94,589	58,672	183,325	116,604
Fair value option securities	3,116	437	7,009	928
Restricted equity securities	6,429	1,384	12,237	2,491
Interest-bearing cash and cash equivalents	9,552	1,737	16,058	2,210
Total interest revenue	570,367	294,247	1,087,096	577,346
Interest expense [Abstract]
Deposits	136,666	13,862	231,940	21,460
Borrowed funds	109,221	4,894	176,259	10,682
Subordinated debentures	2,219	1,473	4,288	2,775
Total interest expense	248,106	20,229	412,487	34,917
Net interest revenue	322,261	274,018	674,609	542,429
Provision for credit losses	17,000	0	33,000	0
Net interest revenue after provision for credit losses	305,261	274,018	641,609	542,429
Total fees and commissions	200,497	173,373	386,476	271,008
Other gains (losses), net	12,618	(7,639)	14,869	(9,283)
Loss on derivatives, net	(8,159)	(13,569)	(9,503)	(60,550)
Loss on fair value option securities, net	(2,158)	(2,221)	(5,120)	(13,422)
Change in fair value of mortgage servicing rights	9,261	17,485	3,202	66,595
Gain (loss) on available for sale securities, net	(3,010)	1,188	(3,010)	2,125
Total other operating revenue	209,049	168,617	386,914	256,473
Other operating expense [Abstract]
Personnel	190,652	154,923	372,797	314,151
Business promotion	7,640	6,325	16,209	12,838
Charitable contributions to BOKF Foundation	1,142	0	1,142	0
Professional fees and services	12,777	12,475	25,825	23,888
Net occupancy and equipment	30,105	27,489	58,564	58,344
Insurance	6,974	4,728	14,289	9,011
Data processing and communications	45,307	41,280	90,109	81,116
Printing, postage and supplies	3,728	3,929	7,621	7,618
Amortization of intangible assets	3,474	4,049	6,865	8,013
Mortgage banking costs	8,300	9,437	14,082	17,314
Other expense	8,574	9,020	16,982	18,980
Total other operating expense	318,673	273,655	624,485	551,273
Net income before taxes	195,637	168,980	404,038	247,629
Federal and state income taxes	44,001	36,122	89,906	52,319
Net income	151,636	132,858	314,132	195,310
Net income (loss) attributable to non-controlling interests	328	12	456	(24)
Net income attributable to BOK Financial Corporation shareholders	$ 151,308	$ 132,846	$ 313,676	$ 195,334
Earnings Per Share [Abstract]
Basic	$ 2.27	$ 1.96	$ 4.70	$ 2.87
Diluted	$ 2.27	$ 1.96	$ 4.70	$ 2.87
Average shares used in computation: [Abstract]
Basic	65,994,132	67,453,748	66,162,048	67,616,396
Diluted	65,994,132	67,455,172	66,162,048	67,617,834
Dividends declared per share	$ 0.54	$ 0.53	$ 1.08	$ 1.06
Brokerage and trading revenue [Member]
Total fees and commissions	$ 65,006	$ 44,043	$ 117,402	$ 16,964
Transaction card revenue [Member]
Total fees and commissions	26,003	26,940	51,624	51,156
Fiduciary and asset management revenue [Member]
Total fees and commissions	52,997	49,838	103,654	96,237
Deposit service charges and fees [Member]
Total fees and commissions	27,100	28,500	53,068	55,504
Mortgage banking revenue [Member]
Total fees and commissions	15,141	11,368	29,508	28,018
Other revenue [Member]
Total fees and commissions	$ 14,250	$ 12,684	$ 31,220	$ 23,129