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Note 8 - Deposits (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Summary of Deposits [Table Text Block]
   
As of December 31,
  
   
201
7
    
201
6
  
   
(In thousands
)
  
                 
Demand
   $
2,783,127
     $
2,478,107
  
NOW accounts
    
1,410,519
      
1,230,445
  
Money market accounts
    
2,248,271
      
2,198,938
  
Saving accounts
    
857,199
      
719,949
  
Time deposits
    
5,390,777
      
5,047,287
  
Total
   $
12,689,893
     $
11,674,726
  
Schedule of Maturities for Time Deposits [Table Text Block]
     
Expected Maturity Date at December 31
,
    
 
 
 
     
201
8
    
201
9
    
202
0
    
202
1
    
202
2
    
Thereafte
r
    
Tota
l
  
 
(In thousands
)
  
Time deposits
   $
4,724,089
     $
532,188
     $
133,824
     $
73
     $
592
     $
11
     $
5,390,777
  
Summary of Interest Expense on Deposits [Table Text Block]
   
Year Ended December 31
,
  
   
201
7
    
201
6
    
201
5
  
   
(In thousands
)
  
Interest bearing demand
   $
2,242
     $
1,740
     $
1,406
  
Money market accounts
    
15,062
      
13,308
      
10,138
  
Saving accounts
    
1,772
      
1,046
      
901
  
Time deposits
    
46,768
      
43,327
      
39,443
  
Total
   $
65,844
     $
59,421
     $
51,888