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Note 6 - Loans Acquired (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 15, 2015
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Sep. 30, 2016
Mar. 31, 2015
FDIC Indemnification Asset, Cash Payments Received $ 2,368,000 $ 2,368,000            
Gain (Loss) on Contract Termination $ (7,476,000) $ (7,476,000) $ (7,476,000)      
Non Covered Impaired Loans Allowance Reclassified         954,000      
Covered Purchased Impaired Loans Allowance     418,000 954,000 $ 954,000      
FDIC Indemnification Asset, Accretion of Discount     0 0        
Acquired Loans [Member]                
Non Covered Impaired Loans Allowance Reclassified     418,000 $ 954,000        
OKSB Merger [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net     1,985,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross     2,021,000,000          
Loans Acquired Discount     36,300,000          
OKSB Merger [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net     11,400,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross     18,100,000          
Loans Acquired Discount     6,700,000          
First Texas Merger [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net     2,208,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross     2,246,000,000          
Loans Acquired Discount     $ 37,800,000          
Hardeman County Investment Company, Inc. [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net           $ 249,200,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross           254,200,000    
Loans Acquired Discount           5,000,000    
Hardeman County Investment Company, Inc. [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net           2,400,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross           3,400,000    
Loans Acquired Discount           $ 990,000    
Citizens National Bank [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net             $ 340,100,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross             348,800,000  
Loans Acquired Discount             8,700,000  
Citizens National Bank [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net             757,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross             1,600,000  
Loans Acquired Discount             $ 848,000  
Liberty Bancshares, Inc. [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net               $ 769,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross               774,800,000
Loans Acquired Discount               4,900,000
Liberty Bancshares, Inc. [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net               10,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross               15,700,000
Loans Acquired Discount               5,000,000
Community First Bancshares Inc [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net               1,130,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross               1,150,000,000
Loans Acquired Discount               23,700,000
Community First Bancshares Inc [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net               7,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross               10,100,000
Loans Acquired Discount               $ 3,100,000