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Earnings Per Share | 9 Months Ended
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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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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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