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Note 11 - Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
    March 31, 2018   December 31, 2017
    Notional   Net Carrying   Notional   Net Carrying
(In thousands)   Amount   Value
(1)
   Amount   Value
(1)
Interest rate swaps (fair value hedge)   $
253,784
     $
13,179
     $
199,341
     $
6,971
  
Interest rate swaps (fair value hedge)    
9,508
      
(99
 )    
62,564
      
(921
 )
Interest rate swaps (cash flow hedge)    
441,500
      
8,675
      
250,000
      
417
  
Interest rate swaps (cash flow hedge)    
-
      
-
      
191,500
      
(7
 )
Interest rate swaps (non-hedge)    
36,321
      
(1,554
 )    
36,321
      
(2,830
 )
Total derivatives   $
741,113
     $
20,201
     $
739,726
     $
3,630
  
Derivative Instruments, Gain (Loss) [Table Text Block]
    For the three months ended
    March 31,
(In thousands)   2018   2017
Financial Derivatives:                
Interest rate swaps (non-hedge)   $
1,276
     $
232
  
Interest rate swaps (fair value hedge)    
454
      
(66
 )
Net gain
(1)
   $
1,730
     $
166
  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
    March 31, 2018
                Gross Amounts Not Offset in the
Consolidated Statement of
Condition		    
(In thousands)   Gross Amount of
Recognized Assets		   Gross Amount Offset
in the Statement of
Condition		   Net Amount of Assets
Presented in the Statement of
Condition		   Financial
Instruments		   Cash Collateral
Received		   Net Amount
                                                 
Interest rate swaps   $
21,854
     $
-
     $
21,854
     $
-
     $
20,940
     $
914
  
                Gross Amounts Not Offset in the
Consolidated Statement of
Condition		    
(In thousands)   Gross Amount of
Recognized
Liabilities		   Gross Amount Offset
in the Statement of
Condition		   Net Amount of Liabilities
Presented in the Statement of
Condition		   Financial
Instruments		   Cash Collateral
Pledged		   Net Amount
                                                 
Interest rate swaps   $
1,653
     $
-
     $
1,653
     $
-
   $
-
     $
1,653
  
    December 31, 2017
                Gross Amounts Not Offset in the
Consolidated Statement of
Condition		    
(In thousands)   Gross Amount of
Recognized Assets		   Gross Amount Offset
in the Statement of
Condition		   Net Amount of Assets
Presented in the Statement of
Condition		   Financial
Instruments		   Cash Collateral
Received		   Net Amount
                                                 
Interest rate swaps   $
7,388
     $
-
     $
7,388
     $
-
     $
3,660
     $
3,728
  
                Gross Amounts Not Offset in the
Consolidated Statement of
Condition		    
(In thousands)   Gross Amount of
Recognized
Liabilities		   Gross Amount Offset
in the Statement of
Condition		   Net Amount of Liabilities
Presented in the Statement of
Condition		   Financial
Instruments		   Cash Collateral
Pledged		   Net Amount
                                                 
Interest rate swaps   $
3,758
     $
-
     $
3,758
     $
-
     $
-
     $
3,758