Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest revenue [Abstract]
Loans	$ 178,373	$ 197,574
Residential mortgage loans held for sale	1,394	1,380
Trading securities	40,975	35,922
Investment securities	2,354	2,726
Available for sale securities	57,932	58,608
Fair value option securities	491	496
Restricted equity securities	1,107	1,359
Interest-bearing cash and cash equivalents	473	174
Total interest revenue	283,099	298,239
Interest expense [Abstract]
Deposits	7,598	9,850
Borrowed funds	5,788	4,622
Subordinated debentures	1,302	3,347
Total interest expense	14,688	17,819
Net interest revenue	268,411	280,420
Provision for credit losses	0	(25,000)
Net interest revenue after provision for credit losses	268,411	305,420
Total fees and commissions	97,635	162,152
Other gains (losses), net	(1,644)	10,121
Loss on derivatives, net	(46,981)	(27,650)
Loss on fair value option securities, net	(11,201)	(1,910)
Change in fair value of mortgage servicing rights	49,110	33,874
Gain on available for sale securities, net	937	467
Total other operating revenue	87,856	177,054
Other operating expense [Abstract]
Personnel	159,228	173,010
Business promotion	6,513	2,154
Charitable contributions to BOKF Foundation	0	4,000
Professional fees and services	11,413	11,980
Net occupancy and equipment	30,855	26,662
Insurance	4,283	4,620
Data processing and communications	39,836	37,467
Printing, postage and supplies	3,689	3,440
Amortization of intangible assets	3,964	4,807
Mortgage banking costs	7,877	13,943
Other expense	9,960	13,701
Total other operating expense	277,618	295,784
Net income before taxes	78,649	186,690
Federal and state income taxes	16,197	42,382
Net income	62,452	144,308
Net loss attributable to non-controlling interests	(36)	(1,752)
Net income attributable to BOK Financial Corporation shareholders	$ 62,488	$ 146,060
Dividends declared per share	$ 0.53	$ 0.52
Earnings Per Share [Abstract]
Basic	0.91	2.10
Diluted	$ 0.91	$ 2.10
Average shares used in computation: [Abstract]
Basic	67,812,400	69,137,375
Diluted	67,813,851	69,141,710
Brokerage and trading revenue [Member]
Total fees and commissions	$ (27,079)	$ 20,782
Transaction card revenue [Member]
Total fees and commissions	24,216	22,430
Fiduciary and asset management revenue [Member]
Total fees and commissions	46,399	41,322
Deposit service charges and fees [Member]
Total fees and commissions	27,004	24,209
Mortgage banking revenue [Member]
Total fees and commissions	16,650	37,113
Other revenue [Member]
Total fees and commissions	$ 10,445	$ 16,296