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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
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
 
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
 
Net income attributable to BOK Financial Corp. shareholders
 
$
500,758

 
$
445,646

 
$
334,644

Less: Earnings allocated to participating securities
 
3,227

 
3,737

 
3,561

Numerator for basic earnings per share – income available to common shareholders
 
497,531

 
441,909

 
331,083

Effect of reallocating undistributed earnings of participating securities
 
—

 
1

 
2

Numerator for diluted earnings per share – income available to common shareholders
 
$
497,531

 
$
441,910

 
$
331,085

 
 
 
 
 
 
 
Denominator:
 
 

 
 
 
 

Weighted average shares outstanding
 
71,250,081

 
67,190,257

 
65,440,832

Less:  Participating securities included in weighted average shares outstanding
 
462,381

 
561,617

 
695,468

Denominator for basic earnings per common share
 
70,787,700

 
66,628,640

 
64,745,364

Dilutive effect of employee stock compensation plans
 
14,912

 
33,633

 
60,920

Denominator for diluted earnings per common share
 
70,802,612

 
66,662,273

 
64,806,284

 
 
 
 
 
 
 
Basic earnings per share
 
$
7.03

 
$
6.63

 
$
5.11

Diluted earnings per share
 
$
7.03

 
$
6.63

 
$
5.11