Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 134,479	$ 156,591	$ 448,611	$ 351,901
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change in unrealized gain (loss)	(135,614)	(412,084)	(171,977)	(1,293,661)
Reclassification Adjustments Included in Earnings [Abstract]
Interest revenue, Investment securities	14,912	21,675	46,996	24,130
Operating expense, Personnel	0	(3,483)	0	(3,483)
Loss (gain) on available for sale securities, net	0	(892)	3,010	(3,017)
Other comprehensive income (loss) before income taxes	(120,702)	(394,784)	(121,971)	(1,276,031)
Federal and state income taxes	(28,389)	(92,467)	(29,941)	(298,715)
Other comprehensive income (loss), net of income taxes	(92,313)	(302,317)	(92,030)	(977,316)
Comprehensive income (loss)	42,166	(145,726)	356,581	(625,415)
Comprehensive income (loss) attributable to non-controlling interests	(16)	81	440	57
Comprehensive income (loss) attributable to BOK Financial Corp. shareholders	$ 42,182	$ (145,807)	$ 356,141	$ (625,472)