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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share
(In thousands, except share and per share amounts)
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
 
Net income attributable to BOK Financial Corp.
 
$
87,382

 
$
85,101

 
$
268,626

 
$
218,882

Earnings allocated to participating securities
 
(278
)
 
(680
)
 
(1,994
)
 
(1,700
)
Numerator for basic earnings per share – income available to common shareholders
 
87,104

 
84,421

 
266,632

 
217,182

Effect of reallocating undistributed earnings of participating securities
 
1

 
2

 
6

 
5

Numerator for diluted earnings per share – income available to common shareholders
 
$
87,105

 
$
84,423

 
$
266,638

 
$
217,187

 
 
 
 
 
 
 
 
 
Denominator:
 
 

 
 

 
 

 
 

Weighted average shares outstanding
 
68,183,171

 
68,372,082

 
68,204,078

 
68,403,652

Less:  Participating securities included in weighted average shares outstanding
 
(216,471
)
 
(544,491
)
 
(499,735
)
 
(527,777
)
Denominator for basic earnings per common share
 
67,966,700

 
67,827,591

 
67,704,343

 
67,875,875

Dilutive effect of employee stock compensation plans1
 
368,289

 
209,828

 
277,215

 
251,879

Denominator for diluted earnings per common share
 
68,334,989

 
68,037,419

 
67,981,558

 
68,127,754

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
1.28

 
$
1.24

 
$
3.94

 
$
3.20

Diluted earnings per share
 
$
1.27

 
$
1.24

 
$
3.92

 
$
3.19

1  Excludes employee stock options with exercise prices greater than current market price.
 
87,749

 
773,080

 
270,288

 
771,922