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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
 
Net income attributable to BOK Financial Corp. shareholders
 
$
445,646

 
$
334,644

 
$
232,668

Less: Earnings allocated to participating securities
 
3,737

 
3,561

 
2,883

Numerator for basic earnings per share – income available to common shareholders
 
441,909

 
331,083

 
229,785

Effect of reallocating undistributed earnings of participating securities
 
1

 
2

 
1

Numerator for diluted earnings per share – income available to common shareholders
 
$
441,910

 
$
331,085

 
$
229,786

 
 
 
 
 
 
 
Denominator:
 
 

 
 
 
 

Weighted average shares outstanding
 
67,190,257

 
65,440,832

 
65,901,110

Less:  Participating securities included in weighted average shares outstanding
 
561,617

 
695,468

 
815,483

Denominator for basic earnings per common share
 
66,628,640

 
64,745,364

 
65,085,627

Dilutive effect of employee stock compensation plans1
 
33,633

 
60,920

 
58,271

Denominator for diluted earnings per common share
 
66,662,273

 
64,806,284

 
65,143,898

 
 
 
 
 
 
 
Basic earnings per share
 
$
6.63

 
$
5.11

 
$
3.53

Diluted earnings per share
 
$
6.63

 
$
5.11

 
$
3.53

1  Excludes employee stock options with exercise prices greater than current market price.
 
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