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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator: [Abstract]        
Net income attributable to BOK Financial Corp. shareholders $ 156,510 $ 188,322 $ 351,844 $ 500,803
Less: Earnings allocated to participating securities 1,161 1,351 2,562 3,458
Numerator for basic earnings per share – income available to common shareholders 155,349 186,971 349,282 497,345
Effect of reallocating undistributed earnings of participating securities 0 0 0 0
Numerator for diluted earnings per share – income available to common shareholders $ 155,349 $ 186,971 $ 349,282 $ 497,345
Denominator: [Abstract]        
Weighted average shares outstanding (in shares) 67,503,041 68,852,688 67,902,592 69,243,562
Less: Participating securities included in weighted average shares (in shares) 499,842 493,563 492,803 475,518
Denominator for basic earnings per common share (in shares) 67,003,199 68,359,125 67,409,789 68,768,044
Dilutive effect of employee stock compensation plans (in shares) 1,424 1,746 1,433 2,619
Denominator for diluted earnings per common share (in shares) 67,004,623 68,360,871 67,411,222 68,770,663
Basic earnings per share $ 2.32 $ 2.74 $ 5.18 $ 7.23
Diluted earnings per share $ 2.32 $ 2.74 $ 5.18 $ 7.23