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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) (BancFirst [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Jan. 24, 2014
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Business Combination, Separately Recognized Transactions [Line Items] |  |
Deposits | $ 231 | $ 302
Loans |  | 121.0
Securities |  | 4.8
Other real estate |  | 0.01
Performing [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Loans | $ 98.8 |

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