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Cash Due from Banks Interest-Bearing Deposits and Federal Funds Sold (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summary of average amount of required reserves |  |
Vault cash and excess funds with the Federal Reserve Bank | $ 1,809,584 | $ 1,554,010
Average required reserves | $ 38,949 | $ 35,744

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

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- Definition Vault cash and funds in bank. + References No definition available. + Details
Name: | banf_VaultCashAndFundsInBank
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Vault cash equivalents reserves. + References No definition available. + Details
Name: | banf_VaultCashEquivalentsReserves
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant