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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share [Table Text Block]
The following table presents the computation of basic and diluted earnings per share (dollars in thousands, except per share data):
 
Year Ended
202020192018
Numerator:  
Net income attributable to BOK Financial Corp. shareholders$435,030 $500,758 $445,646 
Less: Earnings allocated to participating securities2,612 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— — 1 
Numerator for diluted earnings per share – income available to common shareholders
$432,418 $497,531 $441,910 
Denominator:  
Weighted average shares outstanding70,259,553 71,250,081 67,190,257 
Less: Participating securities included in weighted average shares outstanding418,576 462,381 561,617 
Denominator for basic earnings per common share69,840,977 70,787,700 66,628,640 
Dilutive effect of employee stock compensation plans3,195 14,912 33,633 
Denominator for diluted earnings per common share69,844,172 70,802,612 66,662,273 
Basic earnings per share$6.19 $7.03 $6.63 
Diluted earnings per share$6.19 $7.03 $6.63