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Junior Subordinated Debentures - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Mar. 31, 2004 | Feb. 29, 2004 | Dec. 31, 2013
Junior Subordinated Debentures [Line Items] |  |  |  |
Junior subordinated notes assumed | 26,804,000 us-gaap_JuniorSubordinatedNotes |  |  | $ 26,804,000 us-gaap_JuniorSubordinatedNotes
Bancfirst Capital Trust Two [Member] |  |  |  |
Junior Subordinated Debentures [Line Items] |  |  |  |
Debt instrument maturity date | Mar. 31, 2034 |  |  |
Bancfirst Capital Trust Two [Member] | Subordinated Debentures Subject to Mandatory Redemption [Member] |  |  |  |
Junior Subordinated Debentures [Line Items] |  |  |  |
Interest rate of securities | 7.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banf_BancfirstCapitalTrustTwoMember / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_SubordinatedDebenturesSubjectToMandatoryRedemptionMember |  |  |
Frequency of payment | Payable January 15, April 15, July 15 and October 15 of each year |  |  |
Junior subordinated notes assumed | 26,800,000 us-gaap_JuniorSubordinatedNotes / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banf_BancfirstCapitalTrustTwoMember / us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis = us-gaap_SubordinatedDebenturesSubjectToMandatoryRedemptionMember |  |  |
Bancfirst Capital Trust Two [Member] | Cumulative Preferred Stock [Member] |  |  |  |
Junior Subordinated Debentures [Line Items] |  |  |  |
Issue of securities |  | $ 1,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banf_BancfirstCapitalTrustTwoMember / us-gaap_StatementClassOfStockAxis = us-gaap_CumulativePreferredStockMember | $ 25,000,000 us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banf_BancfirstCapitalTrustTwoMember / us-gaap_StatementClassOfStockAxis = us-gaap_CumulativePreferredStockMember |
Cumulative trust preferred securities interest rate | 7.20%banf_CumulativeTrustPreferredSecuritiesInterestRate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = banf_BancfirstCapitalTrustTwoMember / us-gaap_StatementClassOfStockAxis = us-gaap_CumulativePreferredStockMember |  |  |

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- Definition Cumulative trust preferred securities interest rate. + References No definition available. + Details
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- Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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