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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2012
Stockholders' Equity [Abstract] |
Summary of shares repurchased under stock purchase program |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Number of shares repurchased |  |  | — |  |  |  | 162,890 |  |  |  | 6,787 |  |  |  | 280,066 |
Average price of shares repurchased |  |  | — |  |  | $ | 34.56 |  |  | $ | 37.70 |  |  | $ | 35.89 |
Shares remaining to be repurchased |  |  | — |  |  |  | 263,834 |  |  |  | 234,964 |  |  |  | 263,834 |
Required capital amounts and the Company's respective ratios |
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | To Be Well Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
|  | (Dollars in thousands) |
As of September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 510,604 |  |  |  | 14.74 | % |  | $ | 277,168 |  |  |  | 8.00 | % |  |  | N/A |  |  |  | N/A |
BancFirst |  |  | 485,030 |  |  |  | 14.04 | % |  |  | 276,288 |  |  |  | 8.00 | % |  | $ | 345,360 |  |  |  | 10.00 | %
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 473,346 |  |  |  | 13.66 | % |  | $ | 138,584 |  |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |
BancFirst |  |  | 447,772 |  |  |  | 12.97 | % |  |  | 138,144 |  |  |  | 4.00 | % |  | $ | 207,216 |  |  |  | 6.00 | %
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Total Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 473,346 |  |  |  | 8.19 | % |  | $ | 175,150 |  |  |  | 3.00 | % |  |  | N/A |  |  |  | N/A |
BancFirst |  |  | 447,772 |  |  |  | 7.76 | % |  |  | 174,503 |  |  |  | 3.00 | % |  | $ | 290,839 |  |  |  | 5.00 | %

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- Definition Tabular disclosure of an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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