Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest revenue [Abstract]
Loans	$ 447,114	$ 399,182	$ 885,791	$ 767,052
Residential mortgage loans held for sale	1,348	1,092	2,271	2,071
Trading securities	74,801	47,821	143,038	81,830
Investment securities	7,564	8,586	15,393	17,514
Available for sale securities	123,828	94,589	237,316	183,325
Fair value option securities	194	3,116	389	7,009
Restricted equity securities	9,192	6,429	18,050	12,237
Interest-bearing cash and cash equivalents	7,776	9,552	14,781	16,058
Total interest revenue	671,817	570,367	1,317,029	1,087,096
Interest expense [Abstract]
Deposits	254,753	136,666	496,877	231,940
Borrowed funds	118,737	109,221	225,941	176,259
Subordinated debentures	2,306	2,219	4,618	4,288
Total interest expense	375,796	248,106	727,436	412,487
Net interest income	296,021	322,261	589,593	674,609
Provision for credit losses	8,000	17,000	16,000	33,000
Net interest income after provision for credit losses	288,021	305,261	573,593	641,609
Total fees and commissions	200,027	200,497	400,591	386,476
Other gains, net	57,375	12,618	61,644	14,869
Loss on derivatives, net	(1,091)	(8,159)	(9,724)	(9,503)
Loss on fair value option securities, net	(94)	(2,158)	(399)	(5,120)
Change in fair value of mortgage servicing rights	3,453	9,261	14,430	3,202
Gain (loss) on available for sale securities, net	34	(3,010)	(45,137)	(3,010)
Total other operating revenue	259,704	209,049	421,405	386,914
Noninterest Expense [Abstract]
Personnel	191,090	190,652	393,743	372,797
Business promotion	8,250	7,640	16,228	16,209
Charitable contributions to BOKF Foundation	13,610	1,142	13,610	1,142
Professional fees and services	13,331	12,777	25,341	25,825
Net occupancy and equipment	30,245	30,105	60,538	58,564
FDIC and other insurance	7,317	6,974	16,057	14,289
FDIC special assessment	1,190	0	7,644	0
Data processing and communications	46,131	45,307	91,695	90,109
Printing, postage and supplies	3,789	3,728	7,786	7,621
Amortization of intangible assets	2,898	3,474	5,901	6,865
Mortgage banking costs	8,532	8,300	14,887	14,082
Other expense	10,307	8,574	23,644	16,982
Total other operating expense	336,690	318,673	677,074	624,485
Net income before taxes	211,035	195,637	317,924	404,038
Federal and state income taxes	47,303	44,001	70,498	89,906
Net income	163,732	151,636	247,426	314,132
Net income attributable to non-controlling interests	19	328	10	456
Net income attributable to BOK Financial Corporation shareholders	$ 163,713	$ 151,308	$ 247,416	$ 313,676
Earnings Per Share [Abstract]
Basic	$ 2.54	$ 2.27	$ 3.83	$ 4.70
Diluted	$ 2.54	$ 2.27	$ 3.83	$ 4.70
Average shares used in computation: [Abstract]
Basic	63,714,204	65,994,132	64,002,154	66,162,048
Diluted	63,714,204	65,994,132	64,002,154	66,162,048
Dividends declared per share	$ 0.55	$ 0.54	$ 1.10	$ 1.08
Brokerage and trading revenue [Member]
Total fees and commissions	$ 53,017	$ 65,006	$ 112,196	$ 117,402
Transaction card revenue [Member]
Total fees and commissions	27,246	26,003	52,739	51,624
Fiduciary and asset management revenue [Member]
Total fees and commissions	57,576	52,997	112,881	103,654
Deposit service charges and fees [Member]
Total fees and commissions	29,572	27,100	58,257	53,068
Mortgage banking revenue [Member]
Total fees and commissions	18,628	15,141	37,595	29,508
Other revenue [Member]
Total fees and commissions	$ 13,988	$ 14,250	$ 26,923	$ 31,220