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Stockholders' Equity - Summary of Authorized Outstanding Preferred and Common Stock (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]      
Common stock, shares authorized 20,000,000us-gaap_CommonStockSharesAuthorized 20,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, shares outstanding 15,504,513us-gaap_CommonStockSharesOutstanding 15,333,622us-gaap_CommonStockSharesOutstanding 15,242,308us-gaap_CommonStockSharesOutstanding
Common stock, par value $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare  
Common stock dividend payment terms As declared    
Common stock, voting rights Voting    
Senior Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= banf_SeniorPreferredStockMember		 10,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= banf_SeniorPreferredStockMember		  
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= banf_SeniorPreferredStockMember		    
Preferred stock, par value $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= banf_SeniorPreferredStockMember		 $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= banf_SeniorPreferredStockMember		  
Preferred stock, dividend payment terms As declared    
Preferred stock, voting rights Voting    
Cumulative Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock, shares authorized 900,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember		 900,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember		  
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember		    
Preferred stock, par value $ 5.00us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember		 $ 5.00us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember		  
Preferred stock, dividend payment terms As declared    
Preferred stock, voting rights Non-voting