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Earnings Per Share | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |  |
Net income attributable to BOK Financial Corp. shareholders |  | $ | 154,034 |  |  | $ | 142,231 |  |  | $ | 280,806 |  |  | $ | 390,406 |
Less: Earnings allocated to participating securities |  | 938 |  |  | 875 |  |  | 1,678 |  |  | 2,553 |
Numerator for basic earnings per share – income available to common shareholders |  | 153,096 |  |  | 141,356 |  |  | 279,128 |  |  | 387,853 |
Effect of reallocating undistributed earnings of participating securities |  | — |  |  | 1 |  |  | — |  |  | 1 |
Numerator for diluted earnings per share – income available to common shareholders |  | $ | 153,096 |  |  | $ | 141,357 |  |  | $ | 279,128 |  |  | $ | 387,854 |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding |  | 70,306,233 |  |  | 71,033,405 |  |  | 70,375,628 |  |  | 71,425,855 |
Less: Participating securities included in weighted average shares outstanding |  | 428,367 |  |  | 437,098 |  |  | 416,684 |  |  | 472,311 |
Denominator for basic earnings per common share |  | 69,877,866 |  |  | 70,596,307 |  |  | 69,958,944 |  |  | 70,953,544 |
Dilutive effect of employee stock compensation plans 1 |  | 1,424 |  |  | 13,617 |  |  | 3,109 |  |  | 15,301 |
Denominator for diluted earnings per common share |  | 69,879,290 |  |  | 70,609,924 |  |  | 69,962,053 |  |  | 70,968,845 |
Basic earnings per share |  | $ | 2.19 |  |  | $ | 2.00 |  |  | $ | 3.99 |  |  | $ | 5.47 |
Diluted earnings per share |  | $ | 2.19 |  |  | $ | 2.00 |  |  | $ | 3.99 |  |  | $ | 5.47 |
1 Excludes employee stock options with exercise prices greater than current market price. |  | 19,227 |  |  | — |  |  | — |  |  | — |

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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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