Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest revenue [Abstract]
Loans	$ 367,870	$ 178,373
Residential mortgage loans held for sale	979	1,394
Trading securities	34,009	40,975
Investment securities	8,928	2,354
Available for sale securities	88,736	57,932
Fair value option securities	3,893	491
Restricted equity securities	5,808	1,107
Interest-bearing cash and cash equivalents	6,506	473
Total interest revenue	516,729	283,099
Interest expense [Abstract]
Deposits	95,274	7,598
Borrowed funds	67,038	5,788
Subordinated debentures	2,069	1,302
Total interest expense	164,381	14,688
Net interest revenue	352,348	268,411
Provision for credit losses	16,000	0
Net interest revenue after provision for credit losses	336,348	268,411
Total fees and commissions	185,979	97,635
Other gains (losses), net	2,251	(1,644)
Loss on derivatives, net	(1,344)	(46,981)
Loss on fair value option securities, net	(2,962)	(11,201)
Change in fair value of mortgage servicing rights	(6,059)	49,110
Gain on available for sale securities, net	0	937
Total other operating revenue	177,865	87,856
Other operating expense [Abstract]
Personnel	182,145	159,228
Business promotion	8,569	6,513
Professional fees and services	13,048	11,413
Net occupancy and equipment	28,459	30,855
Insurance	7,315	4,283
Data processing and communications	44,802	39,836
Printing, postage and supplies	3,893	3,689
Amortization of intangible assets	3,391	3,964
Mortgage banking costs	5,782	7,877
Other expense	8,408	9,960
Total other operating expense	305,812	277,618
Net income before taxes	208,401	78,649
Federal and state income taxes	45,905	16,197
Net income	162,496	62,452
Net income (loss) attributable to non-controlling interests	128	(36)
Net income attributable to BOK Financial Corporation shareholders	$ 162,368	$ 62,488
Earnings Per Share [Abstract]
Basic	$ 2.43	$ 0.91
Diluted	$ 2.43	$ 0.91
Average shares used in computation: [Abstract]
Basic	66,331,775	67,812,400
Diluted	66,331,775	67,813,851
Dividends declared per share	$ 0.54	$ 0.53
Brokerage and trading revenue [Member]
Total fees and commissions	$ 52,396	$ (27,079)
Transaction card revenue [Member]
Total fees and commissions	25,621	24,216
Fiduciary and asset management revenue [Member]
Total fees and commissions	50,657	46,399
Deposit service charges and fees [Member]
Total fees and commissions	25,968	27,004
Mortgage banking revenue [Member]
Total fees and commissions	14,367	16,650
Other revenue [Member]
Total fees and commissions	$ 16,970	$ 10,445