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Note 7 - Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
(In thousands)   2017   2016
         
Goodwill   $
842,651
     $
348,505
  
Core deposit premiums:                
Gross carrying amount    
105,984
      
48,692
  
Accumulated amortization    
(16,659
 )    
(10,625
 )
Core deposit premiums, net    
89,325
      
38,067
  
Books of business intangible:                
Gross carrying amount    
15,414
      
15,884
  
Accumulated amortization    
(2,827
 )    
(1,716
 )
Books of business intangible, net    
12,587
      
14,168
  
Other intangibles:                
Gross carrying amount    
6,037
      
2,068
  
Accumulated amortization    
(1,878
 )    
(1,344
 )
Other intangibles, net    
4,159
      
724
  
Other intangible assets, net    
106,071
      
52,959
  
Total goodwill and other intangible assets   $
948,722
     $
401,464
  
Core Deposit Premium [Member]  
Notes Tables  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Year   (In thousands)
2018   $
11,355
  
2019    
11,045
  
2020    
11,032
  
2021    
10,970
  
2022    
10,918
  
Thereafter    
50,751
  
Total   $
106,071