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Junior Subordinated Debentures (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Debt Instrument [Line Items]
Junior subordinated notes	$ 26,804	$ 36,083	$ 28,866
Junior subordinated debentures (Textual) [Abstract]
Debt instrument deferment period	On June 15, 2012, BancFirst Corporation called the Union National Statutory Trust I (“UNST I”), Junior Subordinated Debentures.On June 18, 2012, BancFirst Corporation called the FBC Financial Corp. Statutory Trust I (“FBCST I”), Junior Subordinated Debentures.
BFC II [Member]
Debt Instrument [Line Items]
Junior subordinated notes	26,804	26,804
Debt instrument maturity date	Mar. 31, 2034
Subordinated borrowing interest rate	7.20%
UNST I [Member]
Debt Instrument [Line Items]
Junior subordinated notes		2,062
Debt instrument maturity date	Mar. 15, 2036
Debt instrument, interest rate terms	3 month LIBOR + 1.65%
FBCST I [Member]
Debt Instrument [Line Items]
Junior subordinated notes		$ 7,217
Debt instrument maturity date	Dec. 17, 2033
Debt instrument, interest rate terms	3 month LIBOR + 2.85%

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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