Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest and dividend revenue [Abstract]
Loans	$ 976,653	$ 769,357	$ 889,507
Residential mortgage loans held for sale	6,027	5,465	6,397
Trading securities	115,048	155,989	67,689
Investment securities	24,072	10,430	11,943
Available for sale securities	248,323	230,383	261,196
Fair value option securities	2,145	1,542	18,475
Restricted equity securities	8,282	5,703	10,963
Interest-bearing cash and cash equivalents	11,552	1,060	2,830
Total interest revenue	1,392,102	1,179,929	1,269,000
Interest Expense [Abstract]
Deposits	121,749	33,484	89,996
Borrowed funds	52,483	17,877	56,616
Subordinated debentures	6,490	10,535	13,944
Total interest expense	180,722	61,896	160,556
Net interest and dividend revenue	1,211,380	1,118,033	1,108,444
Provision for credit losses	30,000	(100,000)	222,592
Net interest and dividend revenue after provision for credit losses	1,181,380	1,218,033	885,852
Total fees and commissions	657,213	668,309	810,320
Other gains, net	123	63,742	6,046
Gain (loss) on derivatives, net	(73,011)	(19,378)	42,320
Gain (loss) on fair value option securities, net	(20,358)	(2,239)	53,248
Change in fair value of mortgage servicing rights	80,261	41,637	(79,524)
Gain (loss) on available for sale securities, net	(971)	3,704	9,910
Total other operating revenue	643,257	755,775	842,320
Other operating expense [Abstract]
Personnel	670,918	695,382	688,474
Business promotion	26,435	16,289	14,511
Charitable contributions to BOKF Foundation	2,500	9,000	9,000
Professional fees and services	56,342	50,906	53,437
Net occupancy and equipment	116,867	108,587	112,722
Insurance	17,994	15,881	19,990
Data processing and communications	165,907	151,614	135,497
Printing, postage and supplies	15,857	14,218	15,061
Amortization of intangible assets	15,692	18,311	20,443
Mortgage banking costs	35,834	42,698	56,711
Other expense	40,134	54,822	38,462
Total other operating expense	1,164,480	1,177,708	1,164,308
Net income before taxes	660,157	796,100	563,864
Federal and state income taxes	139,864	179,775	128,793
Net income	520,293	616,325	435,071
Net income (loss) attributable to Non-controlling interests	20	(1,796)	41
Net income attributable to BOK Financial Corporation shareholders	$ 520,273	$ 618,121	$ 435,030
Earnings per share: [Abstract]
Basic (in dollars per share)	$ 7.68	$ 8.95	$ 6.19
Diluted (in dollars per share)	$ 7.68	$ 8.95	$ 6.19
Average shares used in computation: [Abstract]
Basic (in shares)	67,212,728	68,591,920	69,840,977
Diluted (in shares)	67,212,735	68,594,322	69,844,172
Dividends declared per share (in dollars per share)	$ 2.13	$ 2.09	$ 2.05
Brokerage and trading revenue [Member]
Total fees and commissions	$ 140,978	$ 112,989	$ 221,833
Transaction card revenue [Member]
Total fees and commissions	104,266	96,983	90,182
Fiduciary and asset management revenue [Member]
Total fees and commissions	196,326	178,274	167,445
Deposit service charges and fees [Member]
Total fees and commissions	110,636	104,217	96,805
Mortgage banking revenue [Member]
Total fees and commissions	49,365	105,896	182,360
Other revenue [Member]
Total fees and commissions	$ 55,642	$ 69,950	$ 51,695