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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator: [Abstract]:      
Net income attributable to BOK Financial Corp. shareholders $ 435,030 $ 500,758 $ 445,646
Less: Earnings allocated to participating securities 2,612 3,227 3,737
Numerator for basic earnings per share - income available to common shareholders 432,418 497,531 441,909
Effect of reallocating undistributed earnings of participating securities 0 0 1
Numerator for diluted earnings per share - income available to common shareholders $ 432,418 $ 497,531 $ 441,910
Denominator: [Abstract]      
Weighted average shares outstanding 70,259,553 71,250,081 67,190,257
Less: Participating securities included in weighted average shares outstanding (in shares) 418,576 462,381 561,617
Denominator for basic earnings per common share (in shares) 69,840,977 70,787,700 66,628,640
Dilutive effect of employee stock compensation plans (in shares) 3,195 14,912 33,633
Denominator for diluted earnings per common share (in shares) 69,844,172 70,802,612 66,662,273
Basic (in dollars per share) $ 6.19 $ 7.03 $ 6.63
Diluted earnings per share (per share) $ 6.19 $ 7.03 $ 6.63