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Earnings Per Share | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |
Net income attributable to BOK Financial Corp. shareholders |  | $ | 114,372 |  |  | $ | 88,147 |  |  | $ | 219,934 |  |  | $ | 176,503 |
Less: Earnings allocated to participating securities |  | 956 |  |  | 926 |  |  | 1,978 |  |  | 1,929 |
Numerator for basic earnings per share – income available to common shareholders |  | 113,416 |  |  | 87,221 |  |  | 217,956 |  |  | 174,574 |
Effect of reallocating undistributed earnings of participating securities |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Numerator for diluted earnings per share – income available to common shareholders |  | $ | 113,417 |  |  | $ | 87,222 |  |  | $ | 217,957 |  |  | $ | 174,575 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding |  | 65,448,035 |  |  | 65,416,274 |  |  | 65,463,671 |  |  | 65,436,909 |
Less: Participating securities included in weighted average shares outstanding |  | 546,060 |  |  | 686,522 |  |  | 589,104 |  |  | 714,165 |
Denominator for basic earnings per common share |  | 64,901,975 |  |  | 64,729,752 |  |  | 64,874,567 |  |  | 64,722,744 |
Dilutive effect of employee stock compensation plans1 |  | 35,251 |  |  | 63,382 |  |  | 37,985 |  |  | 65,578 |
Denominator for diluted earnings per common share |  | 64,937,226 |  |  | 64,793,134 |  |  | 64,912,552 |  |  | 64,788,322 |
Basic earnings per share |  | $ | 1.75 |  |  | $ | 1.35 |  |  | $ | 3.36 |  |  | $ | 2.70 |
Diluted earnings per share |  | $ | 1.75 |  |  | $ | 1.35 |  |  | $ | 3.36 |  |  | $ | 2.69 |
1 Excludes employee stock options with exercise prices greater than current market price. |  | — |  |  | — |  |  | — |  |  | — |

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- References No definition available. + Details
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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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