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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
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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