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Earnings Per Share | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings Per Share
(In thousands, except share and per share amounts) |  | Three Months Ended March 31,
|  | 2019 |  | 2018
Numerator: |  |  |  |
Net income attributable to BOK Financial Corp. shareholders |  | $ | 110,612 |  |  | $ | 105,562 |
Less: Earnings allocated to participating securities |  | 828 |  |  | 1,022 |
Numerator for basic earnings per share – income available to common shareholders |  | 109,784 |  |  | 104,540 |
Effect of reallocating undistributed earnings of participating securities |  | — |  |  | — |
Numerator for diluted earnings per share – income available to common shareholders |  | $ | 109,784 |  |  | $ | 104,540 |
Denominator: |  |  |  |  |  |
Weighted average shares outstanding |  | $ | 71,926,041 |  |  | $ | 65,479,482 |
Less: Participating securities included in weighted average shares outstanding |  | 538,971 |  |  | 632,148 |
Denominator for basic earnings per common share |  | 71,387,070 |  |  | 64,847,334 |
Dilutive effect of employee stock compensation plans 1 |  | 17,318 |  |  | 40,699 |
Denominator for diluted earnings per common share |  | $ | 71,404,388 |  |  | $ | 64,888,033 |
Basic earnings per share |  | $ | 1.54 |  |  | $ | 1.61 |
Diluted earnings per share |  | $ | 1.54 |  |  | $ | 1.61 |
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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