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Note 17 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
        Fair Value Measurements
(In thousands)   Fair Value   Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  Significant Other
Observable Inputs
(Level 2)
  Significant
Unobservable Inputs
(Level 3)
                 
December 31, 2017                                
Available-for-sale securities                                
U.S. Government agencies   $
139,724
    $
--
    $
139,724
    $
--
 
Mortgage-backed securities    
1,187,317
     
--
     
1,187,317
     
--
 
States and political subdivisions    
143,165
     
--
     
143,165
     
--
 
Other securities    
119,311
     
--
     
119,311
     
--
 
Other assets held for sale    
165,780
     
--
     
--
     
165,780
 
Derivative asset    
3,634
     
--
     
3,634
     
--
 
Other liabilities held for sale    
(157,366
)    
--
     
--
     
(157,366
)
Derivative liability    
(3,068
)    
--
     
(3,068
)    
--
 
                                 
December 31, 2016                                
Available-for-sale securities                                
U.S. Treasury   $
300
    $
300
    $
--
    $
--
 
U.S. Government agencies    
137,771
     
--
     
137,771
     
--
 
Mortgage-backed securities    
868,324
     
--
     
868,324
     
--
 
States and political subdivisions    
102,943
     
--
     
102,943
     
--
 
Other securities    
48,016
     
--
     
48,016
     
--
 
Assets held in trading accounts    
41
     
--
     
41
     
--
 
Derivative asset    
1,199
     
--
     
1,199
     
--
 
Derivative liability    
(1,274
)    
--
     
(1,274
)    
--
 
Fair Value Measurements, Nonrecurring [Table Text Block]
        Fair Value Measurements Using
(In thousands)   Fair Value   Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  Significant Other
Observable Inputs
(Level 2)
  Significant
Unobservable Inputs
(Level 3)
                 
December 31, 2017                                
Impaired loans
(1) (2)
(collateral dependent)
  $
11,229
    $
--
    $
--
    $
11,229
 
Foreclosed assets and other real estate owned
(1)
   
24,093
     
--
     
--
     
24,093
 
                                 
December 31, 2016                                
Impaired loans
(1) (2)
(collateral dependent)
  $
17,154
    $
--
    $
--
    $
17,154
 
Foreclosed assets held for sale
(1)
   
17,806
     
--
     
--
     
17,806
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
    Carrying   Fair Value Measurements
(In thousands)   Amount   Level 1   Level 2   Level 3   Total
                     
December 31, 2017                                        
Financial assets:                                        
Cash and cash equivalents   $
598,042
    $
598,042
    $
--
    $
--
    $
598,042
 
Interest bearing balances due from banks - time    
3,314
     
--
     
3,314
     
--
     
3,314
 
Held-to-maturity securities    
368,058
     
--
     
373,298
     
--
     
373,298
 
Mortgage loans held for sale    
24,038
     
--
     
--
     
24,038
     
24,038
 
Interest receivable    
43,528
     
--
     
43,528
     
--
     
43,528
 
Legacy loans (net of allowance)    
5,663,941
     
--
     
--
     
5,646,505
     
5,646,505
 
Loans acquired (net of allowance)    
5,074,076
     
--
     
--
     
5,058,455
     
5,058,455
 
                                         
Financial liabilities:                                        
Non-interest bearing transaction accounts    
2,665,249
     
--
     
2,665,249
     
--
     
2,665,249
 
Interest bearing transaction accounts and savings deposits    
6,494,896
     
--
     
6,494,896
     
--
     
6,494,896
 
Time deposits    
1,932,730
     
--
     
--
     
1,915,539
     
1,915,539
 
Federal funds purchased and securities sold under agreements to repurchase    
122,444
     
--
     
122,444
     
--
     
122,444
 
Other borrowings    
1,380,024
     
--
     
1,381,365
     
--
     
1,381,365
 
Subordinated debentures    
140,565
     
--
     
136,474
     
--
     
136,474
 
Interest payable    
4,564
     
--
     
4,564
     
--
     
4,564
 
                                         
December 31, 2016                                        
Financial assets                                        
Cash and cash equivalents   $
285,659
    $
285,659
    $
--
    $
--
    $
285,659
 
Interest bearing balances due from banks - time    
4,563
     
--
     
4,563
     
--
     
4,563
 
Held-to-maturity securities    
462,096
     
--
     
465,960
     
--
     
465,960
 
Mortgage loans held for sale    
27,788
     
--
     
--
     
27,788
     
27,788
 
Interest receivable    
27,788
     
--
     
27,788
     
--
     
27,788
 
Legacy loans (net of allowance)    
4,290,921
     
--
     
--
     
4,305,165
     
4,305,165
 
Loans acquired (net of allowance)    
1,305,683
     
--
     
--
     
1,310,017
     
1,310,017
 
                                         
Financial liabilities:                                        
Non-interest bearing transaction accounts    
1,491,676
     
--
     
1,491,676
     
--
     
1,491,676
 
Interest bearing transaction accounts and savings deposits    
3,956,483
     
--
     
3,956,483
     
--
     
3,956,483
 
Time deposits    
1,287,060
     
--
     
--
     
1,278,339
     
1,278,339
 
Federal funds purchased and securities sold under agreements to repurchase    
115,029
     
--
     
115,029
     
--
     
115,029
 
Other borrowings    
273,159
     
--
     
292,367
     
--
     
292,367
 
Subordinated debentures    
60,397
     
--
     
55,318
     
--
     
55,318
 
Interest payable    
1,668
     
--
     
1,668
     
--
     
1,668