Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest revenue [Abstract]
Loans	$ 396,416	$ 438,677
Residential mortgage loans held for sale	975	923
Trading securities	73,739	68,237
Investment securities	6,983	7,829
Available-for-sale securities	127,509	113,488
Fair value option securities	178	195
Restricted equity securities	6,541	8,858
Interest-bearing cash and cash equivalents	6,229	7,005
Total interest revenue	618,570	645,212
Interest expense [Abstract]
Deposits	241,072	242,124
Borrowed funds	59,163	107,204
Subordinated debentures	2,084	2,312
Total interest expense	302,319	351,640
Net interest income	316,251	293,572
Provision for credit losses	0	8,000
Net interest income after provision for credit losses	316,251	285,572
Total fees and commissions	184,116	200,564
Other gains (losses), net	(725)	4,269
Gain (loss) on derivatives, net	9,565	(8,633)
Gain (loss) on fair value option securities, net	325	(305)
Change in fair value of mortgage servicing rights	(7,240)	10,977
Loss on available-for-sale securities, net	0	(45,171)
Total other operating revenue	186,041	161,701
Noninterest Expense [Abstract]
Personnel	214,185	202,653
Business promotion	8,818	7,978
Professional fees and services	13,269	12,010
Net occupancy and equipment	32,992	30,293
FDIC and other insurance	6,587	8,740
FDIC special assessment	523	6,454
Data processing and communications	47,578	45,564
Printing, postage, and supplies	3,639	3,997
Amortization of intangible assets	2,652	3,003
Mortgage banking costs	7,689	6,355
Other expense	9,597	13,337
Total other operating expense	347,529	340,384
Net income before taxes	154,763	106,889
Federal and state income taxes	34,992	23,195
Net income	119,771	83,694
Net income attributable to non-controlling interests	(6)	(9)
Net income attributable to BOK Financial Corporation shareholders	$ 119,777	$ 83,703
Earnings Per Share [Abstract]
Basic	$ 1.86	$ 1.29
Diluted	$ 1.86	$ 1.29
Average shares used in computation: [Abstract]
Basic	63,547,510	64,290,105
Diluted	63,547,510	64,290,105
Dividends declared per share	$ 0.57	$ 0.55
Brokerage and trading revenue [Member]
Total fees and commissions	$ 31,068	$ 59,179
Transaction card revenue [Member]
Total fees and commissions	27,092	25,493
Fiduciary and asset management revenue [Member]
Total fees and commissions	60,972	55,305
Deposit service charges and fees [Member]
Total fees and commissions	30,275	28,685
Mortgage banking revenue [Member]
Total fees and commissions	19,815	18,967
Other revenue [Member]
Total fees and commissions	$ 14,894	$ 12,935