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Note 19 - Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
    December 31, 2018   December 31, 2017
    Notional
Amount		    
Fair Value
(1)
   Notional
Amount		    
Fair Value
(1)
    (In thousands)
Interest rate swaps (fair value hedge)   $
248,330
     $
10,593
     $
199,341
     $
6,971
  
Interest rate swaps (fair value hedge)    
19,468
      
(502
 )    
62,564
      
(921
 )
Interest rate swaps (cash flow hedge)    
441,500
      
5,368
      
250,000
      
417
  
Interest rate swaps (cash flow hedge)    
-
      
-
      
191,500
      
(7
 )
Interest rate swaps (non-hedge)    
36,321
      
(1,737
 )    
36,321
      
(2,830
 )
Total derivatives   $
745,619
     $
13,722
     $
739,726
     $
3,630
  
Derivative Instruments, Gain (Loss) [Table Text Block]
    For the year ended
December 31,
(In thousands)   2018   2017   2016
         
Financial Derivatives:                        
Interest rate swaps (non-hedge)   $
1,094
     $
(102
 )   $
71
  
Interest rate swaps (fair value hedge)    
(175
 )    
(478
 )    
1,466
  
Net gain (loss) (1)   $
919
     $
(580
 )   $
1,537
  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
    December 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   $
15,961
     $
-
     $
15,961
     $
-
     $
14,960
     $
1,001
  
                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   $
2,239
     $
-
     $
2,239
     $
-
     $
-
     $
2,239
  
    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