XML 28 R9.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Recent Developments Including Mergers and Acquisitions | 3 Months Ended
--- | ---
Mar. 31, 2013
Recent Developments Including Mergers and Acquisitions [Abstract] |
RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS | (2) RECENT DEVELOPMENTS, INCLUDING MERGERS AND ACQUISITIONS On January 19, 2012, Council Oak Investment Corporation, a wholly-owned subsidiary of BancFirst, completed the sale of one of its investments that resulted in a pretax gain of approximately $4.5 million. After related expenses and income taxes, the increase in net income approximated $2.6 million. The gain was included in first quarter 2012 earnings.

X
- Details
Name: | banf_RecentDevelopmentsIncludingMergersAndAcquisitionsAbstract
Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recent developments including mergers and acquisitions. + References No definition available. + Details
Name: | banf_RecentDevelopmentsIncludingMergersAndAcquisitionsTextBlock
Namespace Prefix: | banf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration