Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Income Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Income Statements, Captions [Line Items]
Other operating expense	$ 1,365,755	$ 1,332,881	$ 1,164,480
Other gains (losses), net	79,726	56,795	123
Federal and state income taxes	143,091	152,115	139,864
Net income attributable to BOK Financial Corp. shareholders	523,569	530,746	520,273
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	327,952	338,591	273,142
Interest expense	9,216	8,952	6,490
Other operating expense	3,196	5,674	3,005
Total expense	12,412	14,626	9,495
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries	315,540	323,965	263,647
Other gains (losses), net	2,112	32,656	(4,279)
Net income before taxes and equity in undistributed income of subsidiaries	317,652	356,621	259,368
Federal and state income taxes	(2,390)	5,410	(1,776)
Net income before equity in undistributed income of subsidiaries	320,042	351,211	261,144
Equity in undistributed income of bank subsidiaries	226,271	181,487	300,330
Equity in undistributed income of non-bank subsidiaries	(22,744)	(1,952)	(41,201)
Net income attributable to BOK Financial Corp. shareholders	523,569	530,746	520,273
Parent Company [Member] | Dividends, interest and fees received from bank susidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	304,515	329,429	228,689
Parent Company [Member] | Dividends, interest and fees received from non-bank subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	22,151	8,000	43,281
Parent Company [Member] | Other revenue [Member]
Condensed Income Statements, Captions [Line Items]
Total revenue	$ 1,286	$ 1,162	$ 1,172