XML 18 R55.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) | Mar. 31, 2015 | Mar. 31, 2014
--- | --- | ---
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract] |  |
Shares remaining to be repurchased | 194,723 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased | 194,723 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased

X
- Details
Name: | banf_SummaryOfSharesRepurchasedUnderStockPurchaseProgramAbstract
Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant