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Earnings Per Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block] Earnings Per Share  
(In thousands, except share and per share amounts)
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
 
Net income attributable to BOK Financial Corp. shareholders
 
$
117,256

 
$
85,649

 
$
337,190

 
$
262,152

Less: Earnings allocated to participating securities
 
963

 
888

 
2,940

 
2,817

Numerator for basic earnings per share – income available to common shareholders
 
116,293

 
84,761

 
334,250

 
259,335

Effect of reallocating undistributed earnings of participating securities
 
1

 
1

 
1

 
2

Numerator for diluted earnings per share – income available to common shareholders
 
$
116,294

 
$
84,762

 
$
334,251

 
$
259,337

 
 
 
 
 
 
 
 
 
Denominator:
 
 

 
 

 
 

 
 

Weighted average shares outstanding
 
$
65,438,849

 
$
65,423,258

 
$
65,455,306

 
$
65,432,313

Less:  Participating securities included in weighted average shares outstanding
 
537,754

 
680,436

 
571,987

 
702,922

Denominator for basic earnings per common share
 
64,901,095

 
64,742,822

 
64,883,319

 
64,729,391

Dilutive effect of employee stock compensation plans1
 
33,256

 
62,350

 
36,409

 
64,502

Denominator for diluted earnings per common share
 
$
64,934,351

 
$
64,805,172

 
$
64,919,728

 
$
64,793,893

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
1.79

 
$
1.31

 
$
5.15

 
$
4.01

Diluted earnings per share
 
$
1.79

 
$
1.31

 
$
5.15

 
$
4.00

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