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Intangible Assets - Summary of Goodwill by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Balance at beginning of period | $ 44,962 us-gaap_Goodwill | $ 44,962 us-gaap_Goodwill | $ 45,118 us-gaap_Goodwill
Balance at end of period | 44,962 us-gaap_Goodwill | 44,962 us-gaap_Goodwill | 45,118 us-gaap_Goodwill
Metropolitan Banks [Member] |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of period | 8,078 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_MetropolitanBanksMember | 8,078 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_MetropolitanBanksMember |
Balance at end of period | 8,078 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_MetropolitanBanksMember | 8,078 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_MetropolitanBanksMember |
Community Banks [Member] |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of period | 30,970 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_CommunityBanksMember | 30,970 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_CommunityBanksMember |
Balance at end of period | 30,970 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_CommunityBanksMember | 30,970 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_CommunityBanksMember |
Other Financial Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of period | 5,464 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 5,464 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Balance at end of period | 5,464 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 5,464 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Executive, Operations & Support [Member] |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of period | 450 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_ExecutiveOperationsAndSupportMember | 450 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_ExecutiveOperationsAndSupportMember |
Balance at end of period | $ 450 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_ExecutiveOperationsAndSupportMember | $ 450 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = banf_ExecutiveOperationsAndSupportMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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