Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest and dividend revenue [Abstract]
Loans	$ 1,760,774	$ 1,630,620	$ 976,653
Residential mortgage loans held for sale	5,062	4,341	6,027
Trading securities	288,182	215,994	115,048
Investment securities	30,005	33,822	24,072
Available for sale securities	490,543	387,891	248,323
Fair value option securities	761	7,760	2,145
Restricted equity securities	32,903	29,683	8,282
Interest-bearing cash and cash equivalents	28,234	32,353	11,552
Total interest revenue	2,636,464	2,342,464	1,392,102
Interest Expense, Operating
Deposits	1,025,729	626,597	121,749
Borrowed funds	390,761	434,735	52,483
Subordinated debentures	9,216	8,952	6,490
Total interest expense	1,425,706	1,070,284	180,722
Net interest and dividend revenue	1,210,758	1,272,180	1,211,380
Provision for credit losses	18,000	46,000	30,000
Net interest and dividend income after provision for credit losses	1,192,758	1,226,180	1,181,380
Fees and commissions revenue	810,023	781,118	657,213
Other gains, net	79,726	56,795	123
Gain (loss) on derivatives, net	(22,461)	(9,921)	(73,011)
Gain (loss) on fair value option securities, net	(256)	(4,292)	(20,358)
Change in fair value of mortgage servicing rights	18,437	(3,115)	80,261
Loss on available for sale securities, net	(45,828)	(30,636)	(971)
Total other operating revenue	839,641	789,949	643,257
Other operating expense [Abstract]
Personnel	811,239	766,610	670,918
Business promotion	33,274	31,796	26,435
Charitable contributions to BOKF Foundation	13,610	2,707	2,500
Professional fees and services	53,921	55,337	56,342
Net occupancy and equipment	125,328	121,502	116,867
FDIC and other insurance	31,105	30,780	17,994
FDIC special assessment	5,521	43,773	0
Data processing and communications	187,273	181,365	165,907
Printing, postage and supplies	15,079	15,225	15,857
Amortization of intangible assets	11,612	13,882	15,692
Mortgage banking costs	34,638	30,524	35,834
Other expense	43,155	39,380	40,134
Total other operating expense	1,365,755	1,332,881	1,164,480
Net income before taxes	666,644	683,248	660,157
Federal and state income taxes	143,091	152,115	139,864
Net income	523,553	531,133	520,293
Net income (loss) attributable to Non-controlling interests	(16)	387	20
Net income attributable to BOK Financial Corporation shareholders	$ 523,569	$ 530,746	$ 520,273
Earnings per share: [Abstract]
Basic (in dollars per share)	$ 8.14	$ 8.02	$ 7.68
Diluted (in dollars per share)	$ 8.14	$ 8.02	$ 7.68
Average shares used in computation: [Abstract]
Basic (in shares)	63,745,088	65,651,569	67,212,728
Diluted (in shares)	63,745,088	65,651,569	67,212,735
Dividends declared per share (in dollars per share)	$ 2.22	$ 2.17	$ 2.13
Brokerage and trading revenue [Member]
Fees and commissions revenue	$ 218,092	$ 240,610	$ 140,978
Transaction card revenue [Member]
Fees and commissions revenue	108,865	106,858	104,266
Fiduciary and asset management revenue [Member]
Fees and commissions revenue	230,860	207,318	196,326
Deposit service charges and fees [Member]
Fees and commissions revenue	118,745	108,514	110,636
Mortgage banking revenue [Member]
Fees and commissions revenue	74,107	55,698	49,365
Other revenue [Member]
Fees and commissions revenue	$ 59,354	$ 62,120	$ 55,642