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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share [Table Text Block]
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
 
Net income attributable to BOK Financial Corp. shareholders
 
$
351,191

 
$
285,875

 
$
246,754

Earnings allocated to participating securities
 
(2,541
)
 
(2,214
)
 
(1,583
)
Numerator for basic earnings per share – income available to common shareholders
 
348,650

 
283,661

 
245,171

Effect of reallocating undistributed earnings of participating securities
 
6

 
6

 
3

Numerator for diluted earnings per share – income available to common shareholders
 
$
348,656

 
$
283,667

 
$
245,174

 
 
 
 
 
 
 
Denominator:
 
 

 
 
 
 

Weighted average shares outstanding
 
68,221,013

 
68,313,898

 
68,062,047

Less:  Participating securities included in weighted average shares outstanding
 
(536,970
)
 
(526,222
)
 
(434,312
)
Denominator for basic earnings per common share
 
67,684,043

 
67,787,676

 
67,627,735

Dilutive effect of employee stock compensation plans1
 
280,897

 
251,087

 
203,999

Denominator for diluted earnings per common share
 
67,964,940

 
68,038,763

 
67,831,734

 
 
 
 
 
 
 
Basic earnings per share
 
$
5.15

 
$
4.18

 
$
3.63

Diluted earnings per share
 
$
5.13

 
$
4.17

 
$
3.61

1  Excludes employee stock options with exercise prices greater than current market price.
 
224,653

 
769,041

 
1,245,483