Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Summary of Shares Repurchased Under Stock Purchase Program

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

	Three Months Ended March 31,
	2018		2017
Number of shares repurchased		—		—
Average price of shares repurchased	$	—	$	—
Shares remaining to be repurchased		300,000		300,000

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 March 31, 2018:
Total Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	825,088	15.48%	$	426,422		8.00%	$	526,365	9.875%	N/A		N/A
BancFirst		708,338	13.46%		420,910		8.00%		519,560	9.875%	$	526,137		10.00%
Common Equity Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	742,538	13.93%	$	239,862		4.50%	$	339,805	6.375%	N/A		N/A
BancFirst		636,775	12.10%		236,762		4.50%		335,412	6.375%	$	341,989		6.50%
Tier 1 Capital
(to Risk Weighted Assets)-
BancFirst Corporation	$	773,538	14.51%	$	319,816		6.00%	$	419,759	7.875%	N/A		N/A
BancFirst		656,775	12.48%		315,682		6.00%		414,333	7.875%	$	420,910		8.00%
Tier 1 Capital
(to Total Assets)-
BancFirst Corporation	$	773,538	10.43%	$	296,653		4.00%	N/A		N/A	N/A		N/A
BancFirst		656,775	8.96%		293,061		4.00%	N/A		N/A	$	366,327		5.00%