Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Summary of Authorized Outstanding Preferred and Common Stock

As of December 31, 2016, 2015 and 2014 the Company’s authorized and outstanding preferred and common stock was as follows:

	No. of Shares Authorized at		No. of Shares Outstanding at December 31,
Class of Stock	December 31, 2016		2016		2015		2014		Par Value Per Share		Dividends	Voting Rights
Senior Preferred		10,000,000		—		—		—	$	1.00	As declared	Voting
10% Cumulative Preferred		900,000		—		—		—		5.00	As declared	Non-voting
Common		20,000,000		15,810,935		15,597,446		15,504,513		1.00	As declared	Voting

Summary of Shares Repurchased Under Stock Purchase Program

The following table is a summary of the shares under the program:

	Year Ended December 31,
	2016		2015		2014
Number of shares repurchased		100,000		28,447		—
Average price of shares repurchased	$	55.23	$	58.19	$	—
Shares remaining to be repurchased		150,000		166,276		194,723

Required Capital Amounts and Company's Respective Ratios

The actual and required capital amounts and ratios are shown in the following table:

						Required									To Be Well
						For Capital				With					Capitalized Under
						Adequacy				Capital Conservation					Prompt Corrective
	Actual					Purposes				Buffer					Action Provisions
	Amount		Ratio			Amount		Ratio		Amount		Ratio			Amount		Ratio
	(Dollars in thousands)
As of December 31, 2016:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	728,635		15.33	%	$	380,351		8.00%	$	410,066		8.625	%	N/A		N/A
BancFirst		655,620		13.80	%		379,948		8.00%		409,631		8.625	%	$	474,934		10.00	%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	648,942		13.65	%	$	213,947		4.50%	$	243,662		5.125	%	N/A		N/A
BancFirst		586,927		12.36	%		213,720		4.50%		243,404		5.125	%	$	308,707		6.50	%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	679,942		14.30	%	$	285,263		6.00%	$	314,978		6.625	%	N/A		N/A
BancFirst		606,927		12.78	%		284,961		6.00%		314,644		6.625	%	$	379,948		8.00	%
Tier 1 Capital
(to Total Assets)-
BancFirst Corporation	$	679,942		9.94	%	$	273,510		4.00%	N/A		N/A			N/A		N/A
BancFirst		606,927		8.89	%		273,152		4.00%	N/A		N/A			$	341,440		5.00	%
As of December 31, 2015:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	669,213		14.47	%	$	370,094		8.00%	N/A			8.625	%	N/A		N/A
BancFirst		607,604		13.15	%		369,607		8.00%	N/A			8.625	%	$	462,009		10.00	%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	596,547		12.90	%	$	208,178		4.50%	N/A			5.125	%	N/A		N/A
BancFirst		545,938		11.82	%		207,904		4.50%	N/A			5.125	%	$	300,306		6.50	%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	627,547		13.57	%	$	277,570		6.00%	N/A			6.625	%	N/A		N/A
BancFirst		565,938		12.25	%		277,205		6.00%	N/A			6.625	%	$	369,607		8.00	%
Tier 1 Capital
(to Total Assets)-
BancFirst Corporation	$	627,547		9.49	%	$	264,333		4.00%	N/A		N/A			N/A		N/A
BancFirst		565,938		8.59	%		263,606		4.00%	N/A		N/A			$	329,507		5.00	%