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Stockholders Equity (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Required capital amounts and company's respective ratios
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%
BancFirst Corporation [Member]
Required capital amounts and company's respective ratios
Total Capital To Risk Weighted Assets Actual Amount	$ 522,095	$ 489,629
Total Capital To Risk Weighted Assets Actual Ratio	14.36%	14.62%
Capital Required For Capital Adequacy Amount	290,882	267,937
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%	8.00%
Tier 1 Risk Based Capital Amount	483,370	451,973
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.29%	13.49%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	145,441	133,969
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%	4.00%
Tier 1 Capital Amount	483,370	451,973
Tier 1 Capital To Average Assets Ratio	8.10%	8.14%
Tier 1 Capital Required For Capital Adequacy Amount	180,728	168,410
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%	3.00%
BancFirst [Member]
Required capital amounts and company's respective ratios
Total Capital To Risk Weighted Assets Actual Amount	493,621	459,978
Total Capital To Risk Weighted Assets Actual Ratio	13.61%	14.25%
Capital Required For Capital Adequacy Amount	290,236	258,209
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%	8.00%
Capital Required To Be Well Capitalized Amount	362,795	322,761
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%	10.00%
Tier 1 Risk Based Capital Amount	454,896	422,429
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.54%	13.09%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	145,118	129,104
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%	4.00%
Tier 1 Risk Based Capital Required To Be well Capitalized Amount	217,677	193,656
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%	6.00%
Tier 1 Capital Amount	454,896	422,429
Tier 1 Capital To Average Assets Ratio	7.63%	7.88%
Tier 1 Capital Required For Capital Adequacy Amount	180,137	162,234
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%	3.00%
Tier 1 Capital Required To Be Well Capitalized Amount	$ 300,228	$ 270,390
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%	5.00%

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 15

-Subparagraph 3a

-IssueDate 2006-05-01

-Chapter 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 22

-IssueDate 2006-05-01

-Chapter 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Tier 1 capital divided by risk weighted assets as defined by regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 22

-IssueDate 2006-05-01

-Chapter 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 15

-Subparagraph 3a

-IssueDate 2006-05-01

-Chapter 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant