Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net interest revenue from external sources	$ 293,572	$ 352,348
Net interest revenue (expense) from internal sources	0	0
Net interest revenue	293,572	352,348
Net loans charged off and provisions for credit losses	8,000	16,000
Net interest revenue after provision for credit losses	285,572	336,348
Other operating revenue	161,701	177,865
Other operating expense	340,384	305,812
Net direct contribution	106,889	208,401
Gain (loss) on financial instruments, net	0	0
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	0	0
Corporate expense allocations	0	0
Net income before taxes	106,889	208,401
Federal and state income taxes	23,195	45,905
Net income	83,694	162,496
Net income (loss) attributable to non-controlling interests	(9)	128
Net income attributable to BOK Financial Corp. shareholders	83,703	162,368
Average assets	50,027,572	45,982,468
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	282,447	287,988
Net interest revenue (expense) from internal sources	(37,326)	(3,932)
Net interest revenue	245,121	284,056
Net loans charged off and provisions for credit losses	4,160	76
Net interest revenue after provision for credit losses	240,961	283,980
Other operating revenue	50,006	56,845
Other operating expense	70,095	73,134
Net direct contribution	220,872	267,691
Gain (loss) on financial instruments, net	167	(58)
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	0	859
Corporate expense allocations	18,397	17,718
Net income before taxes	202,642	250,774
Federal and state income taxes	49,392	60,543
Net income	153,250	190,231
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	153,250	190,231
Average assets	29,806,817	28,162,934
Operating Segments [Member] | Consumer [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	7,350	21,146
Net interest revenue (expense) from internal sources	94,799	88,235
Net interest revenue	102,149	109,381
Net loans charged off and provisions for credit losses	1,808	1,184
Net interest revenue after provision for credit losses	100,341	108,197
Other operating revenue	36,207	30,610
Other operating expense	53,447	50,198
Net direct contribution	83,101	88,609
Gain (loss) on financial instruments, net	(9,663)	(4,673)
Change in fair value of mortgage servicing rights	10,977	(6,059)
Gain (loss) on repossessed assets, net	107	14
Corporate expense allocations	14,172	11,622
Net income before taxes	70,350	66,269
Federal and state income taxes	16,546	15,586
Net income	53,804	50,683
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	53,804	50,683
Average assets	9,391,981	9,934,511
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	6,999	20,940
Net interest revenue (expense) from internal sources	33,110	33,166
Net interest revenue	40,109	54,106
Net loans charged off and provisions for credit losses	(15)	(24)
Net interest revenue after provision for credit losses	40,124	54,130
Other operating revenue	118,704	108,911
Other operating expense	99,535	82,039
Net direct contribution	59,293	81,002
Gain (loss) on financial instruments, net	0	0
Change in fair value of mortgage servicing rights	0	0
Gain (loss) on repossessed assets, net	0	0
Corporate expense allocations	14,558	12,360
Net income before taxes	44,735	68,642
Federal and state income taxes	10,570	16,195
Net income	34,165	52,447
Net income (loss) attributable to non-controlling interests	0	0
Net income attributable to BOK Financial Corp. shareholders	34,165	52,447
Average assets	15,759,328	11,663,096
Funds Management and Other [Member]
Segment Reporting Information [Line Items]
Net interest revenue from external sources	(3,224)	22,274
Net interest revenue (expense) from internal sources	(90,583)	(117,469)
Net interest revenue	(93,807)	(95,195)
Net loans charged off and provisions for credit losses	2,047	14,764
Net interest revenue after provision for credit losses	(95,854)	(109,959)
Other operating revenue	(43,216)	(18,501)
Other operating expense	117,307	100,441
Net direct contribution	(256,377)	(228,901)
Gain (loss) on financial instruments, net	9,496	4,731
Change in fair value of mortgage servicing rights	(10,977)	6,059
Gain (loss) on repossessed assets, net	(107)	(873)
Corporate expense allocations	(47,127)	(41,700)
Net income before taxes	(210,838)	(177,284)
Federal and state income taxes	(53,313)	(46,419)
Net income	(157,525)	(130,865)
Net income (loss) attributable to non-controlling interests	(9)	128
Net income attributable to BOK Financial Corp. shareholders	(157,516)	(130,993)
Average assets	$ (4,930,554)	$ (3,778,073)