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Note 2 - Acquisitions (Details Textual)
 1 Months Ended 12 Months Ended
Oct. 19, 2017
USD ($)
shares
May 15, 2017
USD ($)
shares
Sep. 09, 2016
USD ($)
shares
Oct. 29, 2015
USD ($)
shares
Feb. 27, 2015
USD ($)
shares
Feb. 28, 2015
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 28, 2015
USD ($)
Goodwill             $ 842,651,000 $ 348,505,000  
OKSB Merger [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 14,488,604                
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 431,400,000                
Payments to Acquire Businesses, Gross $ 95,000,000                
Number of Bank Branches 29                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 2,691,127,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share 2,000,000,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits 1,966,355,000                
Goodwill 228,932,000                
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual             29,200,000    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual             10,500,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans $ 1,996,453,000                
First Texas Merger [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 12,999,840                
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 387,100,000                
Payments to Acquire Businesses, Gross $ 70,000,000                
Number of Bank Branches 15                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 2,428,444,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share 2,200,000,000                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits 1,881,658,000                
Goodwill 238,019,000                
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual             27,600,000    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual             5,700,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans $ 2,208,378,000                
OKSB and First Texas Acquisitions [Member]                  
Business Combination, Acquisition Related Costs             $ 9,400,000    
Hardeman County Investment Company, Inc. [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares   1,599,940              
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned   $ 42,600,000              
Payments to Acquire Businesses, Gross   $ 30,000,000              
Number of Bank Branches   10              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   $ 462,924,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits   388,976,000              
Goodwill   29,371,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans   $ 251,649,000              
Citizens National Bank [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares     1,671,482            
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned     $ 41,300,000            
Payments to Acquire Businesses, Gross     $ 35,000,000            
Number of Bank Branches     9            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     $ 585,149,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share     340,900,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits     509,857,000            
Goodwill     23,376,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans     $ 340,850,000            
Liberty Bancshares, Inc. [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares         10,362,674        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned         $ 212,200,000        
Number of Bank Branches         24        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         $ 1,066,272,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         780,658,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits         874,714,000        
Goodwill         $ 95,207,000        
Community First Bancshares Inc [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares         13,105,830        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned         $ 268,300,000        
Payments to Acquire Businesses, Gross         $ 9,974        
Number of Bank Branches         33        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         $ 1,915,061,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         1,136,543,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits         1,536,062,000        
Goodwill         $ 110,440,000        
Community First Bancshares Inc [Member] | Preferred Stock [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares         30,852        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned         $ 30,900,000        
OTIC and TCO [Member]                  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares       678,580          
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned       $ 17,900,000          
Payments to Acquire Businesses, Gross       5,800,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       14,895,000          
Goodwill       $ 13,268,000          
Assets under Management, Carrying Amount                 $ 1,000,000,000
Number of Investment in Shares Repurchased Through Acquisition | shares           1,000