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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Numerator: [Abstract] |  |  |  |
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: [Abstract] |  |  |  |
Weighted average shares outstanding (in shares) | 65,448,035 | 65,416,274 | 65,463,671 | 65,436,909
Less: Participating securities included in weighted average shares (in shares) | 546,060 | 686,522 | 589,104 | 714,165
Denominator for basic earnings per common share (in shares) | 64,901,975 | 64,729,752 | 64,874,567 | 64,722,744
Dilutive effect of employee stock compensation plans (in shares) | 35,251 | 63,382 | 37,985 | 65,578
Denominator for diluted earnings per common share (in shares) | 64,937,226 | 64,793,134 | 64,912,552 | 64,788,322
Basic earnings per share (per share) | $ 1.75 | $ 1.35 | $ 3.36 | $ 2.70
Diluted earnings per share (per share) | $ 1.75 | $ 1.35 | $ 3.36 | $ 2.69
Excludes employee stock options with exercise prices greater than current market price. | 0 | 0 | 0 | 0

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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