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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) (USD $) | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 19, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 24, 2014
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Goodwill |  | $ 44,962,000 us-gaap_Goodwill | $ 44,545,000 us-gaap_Goodwill |
Pretax gain on sale of investments | 4,500,000 us-gaap_GainLossOnInvestments |  |  |
Gain on sale of investments, Net of tax | 2,600,000 us-gaap_InvestmentIncomeNet |  |  |
BancFirst [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Deposits assumed |  | 174,400,000 banf_BusinessAcquisitionPurchasePriceAllocationDepositsAssumed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 302,000,000 banf_BusinessAcquisitionPurchasePriceAllocationDepositsAssumed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Loans |  |  |  | 121,000,000 banf_BusinessAcquisitionPurchasePriceAllocationLoansAcquired / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Securities |  |  |  | 4,800,000 banf_BusinessAcquisitionPurchasePriceAllocationSecuritiesAcquired / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other real estate |  |  |  | 10,000 banf_BusinessAcquisitionPurchasePriceAllocationOtherRealEstate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Intangibles assets, net |  |  |  | 2,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Goodwill |  |  |  | 417,000 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
BancFirst [Member] | Performing [Member] |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Loans |  | $ 74,800,000 banf_BusinessAcquisitionPurchasePriceAllocationLoansAcquired / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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