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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Summary of Shares Repurchased Under Stock Purchase Program | The following table is a summary of the shares under the program:
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Number of shares repurchased |  |  | — |  |  |  | 100,000 |
Average price of shares repurchased |  | $ | — |  |  | $ | 55.23 |
Shares remaining to be repurchased |  |  | 150,000 |  |  |  | 66,276 |
Required Capital Amounts and Company's Respective Ratios | The actual and required capital amounts and ratios are shown in the following table:
|  |  |  |  |  |  |  |  |  | Required |  |  |  |  |  | To Be Well |
|  |  |  |  |  |  |  |  |  | For Capital |  |  | With |  |  | Capitalized Under |
|  |  |  |  |  |  |  |  |  | Adequacy |  |  | Capital Conservation |  |  | Prompt Corrective |
|  | Actual |  |  | Purposes |  |  | Buffer |  |  | Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
|  | (Dollars in thousands) |
As of March 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 743,955 |  |  |  | 15.72% |  |  | $ | 378,690 |  |  |  | 8.00% |  |  | $ | 437,861 |  |  |  | 9.250% |  |  | N/A |  |  | N/A |
BancFirst |  |  | 668,329 |  |  |  | 14.14% |  |  |  | 378,252 |  |  |  | 8.00% |  |  |  | 437,354 |  |  |  | 9.250% |  |  | $ | 472,815 |  |  |  | 10.00% |
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 665,034 |  |  |  | 14.05% |  |  | $ | 213,013 |  |  |  | 4.50% |  |  | $ | 272,184 |  |  |  | 5.750% |  |  | N/A |  |  | N/A |
BancFirst |  |  | 600,408 |  |  |  | 12.70% |  |  |  | 212,767 |  |  |  | 4.50% |  |  |  | 271,869 |  |  |  | 5.750% |  |  | $ | 307,330 |  |  |  | 6.50% |
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 696,034 |  |  |  | 14.70% |  |  | $ | 284,018 |  |  |  | 6.00% |  |  | $ | 343,188 |  |  |  | 7.250% |  |  | N/A |  |  | N/A |
BancFirst |  |  | 620,408 |  |  |  | 13.12% |  |  |  | 283,689 |  |  |  | 6.00% |  |  |  | 342,791 |  |  |  | 7.250% |  |  | $ | 378,252 |  |  |  | 8.00% |
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Total Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 696,034 |  |  |  | 9.95% |  |  | $ | 279,674 |  |  |  | 4.00% |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
BancFirst |  |  | 620,408 |  |  |  | 8.88% |  |  |  | 279,412 |  |  |  | 4.00% |  |  | N/A |  |  | N/A |  |  | $ | 349,266 |  |  |  | 5.00% |

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