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Recent Developments, Including Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2017
Recent Developments Including Mergers And Acquisitions [Abstract]
Recent Developments, Including Mergers and Acquisitions	(2) RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS Effective June 1, 2017, the Company organized a new captive insurance company named BancFirst Risk and Insurance Company ("the Captive"). The Captive is a wholly-owned subsidiary of BancFirst Corporation and is regulated by the Oklahoma Insurance Department. It insures certain risks of the Company and has entered into reinsurance agreements with a risk-sharing pool.

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