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Recent Developments Including Mergers and Acquisitions (Details) (USD $)
 1 Months Ended
Jan. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Acquisitions
Oct. 31, 2010
Dec. 31, 2010
Business Combination Consolidated Value [Member]
Jul. 12, 2011
FBC Financial Corporation [Member]
Jul. 12, 2011
1st Bank Oklahoma [Member]
Dec. 15, 2010
Okemah National Bank [Member]
Dec. 10, 2010
Exchange National Bank of Moore [Member]
Oct. 08, 2010
Union Bank of Chandler [Member]
Recent Transactions Including Mergers Acquisitions (Textual) [Abstract]                      
Premium paid above equity capital             $ 1,500,000        
Total assets   6,022,250,000 5,608,825,000 5,060,249,000   371,000,000   217,000,000 73,000,000 147,000,000 134,000,000
Loans   3,203,702,000 2,975,842,000     169,000,000   116,000,000 32,000,000 47,000,000 90,000,000
Deposits   5,440,830,000 5,037,735,000     295,000,000   178,000,000 62,000,000 116,000,000 117,000,000
Equity capital   519,567,000 483,041,000 458,594,000       18,000,000 9,000,000 10,000,000 15,000,000
Recent Transactions Including Mergers Acquisitions (Additional Textual) [Abstract]                      
Pretax gain on sale of investments 4,500,000                    
Gain on sale of investments, Net of tax 2,600,000                    
Goodwill and core deposit intangibles       13,300,000              
Number of acquisitions       3              
Student loans held for sale         144,500,000            
Prepaid deposit insurance   $ 9,700,000 $ 12,300,000