Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and dividend revenue [Abstract]
Loans	$ 1,630,620	$ 976,653	$ 769,357
Residential mortgage loans held for sale	4,341	6,027	5,465
Trading securities	215,994	115,048	155,989
Investment securities	33,822	24,072	10,430
Available for sale securities	387,891	248,323	230,383
Fair value option securities	7,760	2,145	1,542
Restricted equity securities	29,683	8,282	5,703
Interest-bearing cash and cash equivalents	32,353	11,552	1,060
Total interest revenue	2,342,464	1,392,102	1,179,929
Interest Expense [Abstract]
Deposits	626,597	121,749	33,484
Borrowed funds	434,735	52,483	17,877
Subordinated debentures	8,952	6,490	10,535
Total interest expense	1,070,284	180,722	61,896
Net interest and dividend revenue	1,272,180	1,211,380	1,118,033
Provision for credit losses	46,000	30,000	(100,000)
Net interest and dividend revenue after provision for credit losses	1,226,180	1,181,380	1,218,033
Total fees and commissions	781,118	657,213	668,309
Other gains, net	56,795	123	63,742
Loss on derivatives, net	(9,921)	(73,011)	(19,378)
Loss on fair value option securities, net	(4,292)	(20,358)	(2,239)
Change in fair value of mortgage servicing rights	(3,115)	80,261	41,637
Gain (loss) on available for sale securities, net	(30,636)	(971)	3,704
Total other operating revenue	789,949	643,257	755,775
Other operating expense [Abstract]
Personnel	766,610	670,918	695,382
Business promotion	31,796	26,435	16,289
Charitable contributions to BOKF Foundation	2,707	2,500	9,000
Professional fees and services	55,337	56,342	50,906
Net occupancy and equipment	121,502	116,867	108,587
FDIC and other insurance	30,780	17,994	15,881
FDIC special assessment	43,773	0	0
Data processing and communications	181,365	165,907	151,614
Printing, postage and supplies	15,225	15,857	14,218
Amortization of intangible assets	13,882	15,692	18,311
Mortgage banking costs	30,524	35,834	42,698
Other expense	39,380	40,134	54,822
Total other operating expense	1,332,881	1,164,480	1,177,708
Net income before taxes	683,248	660,157	796,100
Federal and state income taxes	152,115	139,864	179,775
Net income	531,133	520,293	616,325
Net income (loss) attributable to Non-controlling interests	387	20	(1,796)
Net income attributable to BOK Financial Corporation shareholders	$ 530,746	$ 520,273	$ 618,121
Earnings per share: [Abstract]
Basic (in dollars per share)	$ 8.02	$ 7.68	$ 8.95
Diluted (in dollars per share)	$ 8.02	$ 7.68	$ 8.95
Average shares used in computation: [Abstract]
Basic (in shares)	65,651,569	67,212,728	68,591,920
Diluted (in shares)	65,651,569	67,212,735	68,594,322
Dividends declared per share (in dollars per share)	$ 2.17	$ 2.13	$ 2.09
Brokerage and trading revenue [Member]
Total fees and commissions	$ 240,610	$ 140,978	$ 112,989
Transaction card revenue [Member]
Total fees and commissions	106,858	104,266	96,983
Fiduciary and asset management revenue [Member]
Total fees and commissions	207,318	196,326	178,274
Deposit service charges and fees [Member]
Total fees and commissions	108,514	110,636	104,217
Mortgage banking revenue [Member]
Total fees and commissions	55,698	49,365	105,896
Other revenue [Member]
Total fees and commissions	$ 62,120	$ 55,642	$ 69,950