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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2014 BancFirst [Member] | Jan. 24, 2014 BancFirst [Member] | Jun. 30, 2014 BancFirst [Member] Performing [Member]
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Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Deposits |  |  |  | $ 225,600,000 | $ 302,000,000 |
Loans |  |  |  |  | 121,000,000 | 83,600,000
Securities |  |  |  |  | 4,800,000 |
Other real estate |  |  |  |  | 10,000 |
Intangibles assets, net | 11,574,000 | 10,273,000 | 11,100,000 |  | 2,200,000 |
Goodwill | $ 44,962,000 | $ 44,545,000 | $ 44,545,000 |  | $ 417,000 |

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