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Earnings Per Share | 6 Months Ended
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Jun. 30, 2020
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, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |  |
Net income attributable to BOK Financial Corp. shareholders |  | $ | 64,693 |  |  | $ | 137,563 |  |  | $ | 126,772 |  |  | $ | 248,175 |
Less: Earnings allocated to participating securities |  | 397 |  |  | 850 |  |  | 740 |  |  | 1,678 |
Numerator for basic earnings per share – income available to common shareholders |  | 64,296 |  |  | 136,713 |  |  | 126,032 |  |  | 246,497 |
Effect of reallocating undistributed earnings of participating securities |  | — |  |  | — |  |  | — |  |  | — |
Numerator for diluted earnings per share – income available to common shareholders |  | $ | 64,296 |  |  | $ | 136,713 |  |  | $ | 126,032 |  |  | $ | 246,497 |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding |  | 70,307,606 |  |  | 71,327,928 |  |  | 70,410,707 |  |  | 71,625,332 |
Less: Participating securities included in weighted average shares outstanding |  | 431,563 |  |  | 440,865 |  |  | 410,842 |  |  | 489,918 |
Denominator for basic earnings per common share |  | 69,876,043 |  |  | 70,887,063 |  |  | 69,999,865 |  |  | 71,135,414 |
Dilutive effect of employee stock compensation plans1 |  | 1,424 |  |  | 14,970 |  |  | 3,952 |  |  | 16,144 |
Denominator for diluted earnings per common share |  | 69,877,467 |  |  | 70,902,033 |  |  | 70,003,817 |  |  | 71,151,558 |
Basic earnings per share |  | $ | 0.92 |  |  | $ | 1.93 |  |  | $ | 1.80 |  |  | $ | 3.47 |
Diluted earnings per share |  | $ | 0.92 |  |  | $ | 1.93 |  |  | $ | 1.80 |  |  | $ | 3.46 |
1 Excludes employee stock options with exercise prices greater than current market price. |  | 22,238 |  |  | — |  |  | — |  |  | — |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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