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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Authorized Outstanding Preferred and Common Stock | As of December 31, 2018, 2017 and 2016 the Company’s authorized and outstanding preferred and common stock was as follows:
|  | No. of Shares Authorized at |  |  | No. of Shares Outstanding at December 31, |  |  |  |  |  |  |  |  |
Class of Stock |  | December 31, 2018 |  |  | 2018 |  |  | 2017 |  |  | 2016 |  |  | Par Value Per Share |  |  | Dividends |  | Voting Rights
Senior Preferred |  |  | 10,000,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $ | 1.00 |  |  | As declared |  | Voting
10% Cumulative Preferred |  |  | 900,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5.00 |  |  | As declared |  | Non-voting
Common |  |  | 40,000,000 |  |  |  | 32,603,926 |  |  |  | 31,894,563 |  |  |  | 31,621,870 |  |  |  | 1.00 |  |  | As declared |  | Voting
Summary of Shares Repurchased Under Stock Purchase Program | The following table is a summary of the shares under the program:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Number of shares repurchased |  |  | 151,264 |  |  |  | — |  |  |  | 200,000 |
Average price of shares repurchased |  | $ | 52.32 |  |  | $ | — |  |  | $ | 27.62 |
Shares remaining to be repurchased |  |  | 148,736 |  |  |  | 300,000 |  |  |  | 300,000 |
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 December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 886,190 |  |  |  | 16.29 | % |  | $ | 435,208 |  |  |  | 8.00% |  |  | $ | 537,210 |  |  |  | 9.875 | % |  | N/A |  |  | N/A |
BancFirst |  |  | 765,487 |  |  |  | 14.09 | % |  |  | 434,573 |  |  |  | 8.00% |  |  |  | 536,426 |  |  |  | 9.875 | % |  | $ | 543,216 |  |  |  | 10.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 808,801 |  |  |  | 14.87 | % |  | $ | 244,804 |  |  |  | 4.50% |  |  | $ | 346,806 |  |  |  | 6.375 | % |  | N/A |  |  | N/A |
BancFirst |  |  | 694,098 |  |  |  | 12.78 | % |  |  | 244,447 |  |  |  | 4.50% |  |  |  | 346,300 |  |  |  | 6.375 | % |  | $ | 353,090 |  |  |  | 6.50 | %
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 834,801 |  |  |  | 15.35 | % |  | $ | 326,406 |  |  |  | 6.00% |  |  | $ | 428,408 |  |  |  | 7.875 | % |  | N/A |  |  | N/A |
BancFirst |  |  | 714,098 |  |  |  | 13.15 | % |  |  | 325,930 |  |  |  | 6.00% |  |  |  | 427,783 |  |  |  | 7.875 | % |  | $ | 434,573 |  |  |  | 8.00 | %
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Total Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 834,801 |  |  |  | 11.09 | % |  | $ | 301,116 |  |  |  | 4.00% |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
BancFirst |  |  | 714,098 |  |  |  | 9.49 | % |  |  | 300,855 |  |  |  | 4.00% |  |  | N/A |  |  | N/A |  |  | $ | 376,069 |  |  |  | 5.00 | %
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 797,015 |  |  |  | 15.62 | % |  | $ | 408,234 |  |  |  | 8.00% |  |  | $ | 472,020 |  |  |  | 9.250 | % |  | N/A |  |  | N/A |
BancFirst |  |  | 714,964 |  |  |  | 14.03 | % |  |  | 407,698 |  |  |  | 8.00% |  |  |  | 471,401 |  |  |  | 9.250 | % |  | $ | 509,622 |  |  |  | 10.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 714,349 |  |  |  | 14.00 | % |  | $ | 229,632 |  |  |  | 4.50% |  |  | $ | 293,418 |  |  |  | 5.750 | % |  | N/A |  |  | N/A |
BancFirst |  |  | 643,298 |  |  |  | 12.62 | % |  |  | 229,330 |  |  |  | 4.50% |  |  |  | 293,033 |  |  |  | 5.750 | % |  | $ | 331,255 |  |  |  | 6.50 | %
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Risk Weighted Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 745,349 |  |  |  | 14.61 | % |  | $ | 306,175 |  |  |  | 6.00% |  |  | $ | 369,962 |  |  |  | 7.250 | % |  | N/A |  |  | N/A |
BancFirst |  |  | 663,298 |  |  |  | 13.02 | % |  |  | 306,773 |  |  |  | 6.00% |  |  |  | 369,476 |  |  |  | 7.250 | % |  | $ | 407,698 |  |  |  | 8.00 | %
Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(to Total Assets)- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BancFirst Corporation |  | $ | 745,349 |  |  |  | 10.44 | % |  | $ | 285,444 |  |  |  | 4.00% |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
BancFirst |  |  | 663,298 |  |  |  | 9.31 | % |  |  | 285,101 |  |  |  | 4.00% |  |  | N/A |  |  | N/A |  |  | $ | 356,677 |  |  |  | 5.00 | %

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