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Cash Due from Banks Interest-Bearing Deposits and Federal Funds Sold - Summary of Average Amount of Required Reserves (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Average Amount Of Required Reserves [Abstract]
Vault cash and funds on deposit with the Federal Reserve Bank	$ 1,804,028banf_VaultCashAndFundsInBank	$ 1,758,908banf_VaultCashAndFundsInBank
Average required reserves	$ 44,711banf_VaultCashEquivalentsReserves	$ 37,456banf_VaultCashEquivalentsReserves

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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