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Note 21 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [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)
                 
September 30, 2017                                
ASSETS                                
Available-for-sale securities                                
U.S. Government agencies   $
208,220
    $
--
    $
208,220
    $
--
 
Mortgage-backed securities    
959,698
     
--
     
959,698
     
--
 
State and political subdivisions    
84,822
     
--
     
84,822
     
--
 
Other securities    
64,680
     
--
     
64,680
     
--
 
Assets held in trading accounts    
49
     
--
     
49
     
--
 
                                 
December 31, 2016                                
ASSETS                                
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
     
--
 
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)
                 
September 30, 2017                                
ASSETS                                
Impaired loans
(1) (2)
(collateral dependent)
  $
11,229
    $
--
    $
--
    $
11,229
 
Foreclosed assets and other real estate owned
(1)
   
19,506
     
--
     
--
     
19,506
 
                                 
December 31, 2016                                
ASSETS                                
Impaired loans
(1) (2)
(collateral dependent)
  $
17,154
    $
--
    $
--
    $
17,154
 
Foreclosed assets and other real estate owned
(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
                     
September 30, 2017                                        
Financial assets:                                        
Cash and cash equivalents   $
432,290
    $
432,290
    $
--
    $
--
    $
432,290
 
Interest bearing balances due from banks - time    
4,059
     
--
     
4,059
     
--
     
4,059
 
Held-to-maturity securities    
406,033
     
--
     
412,140
     
--
     
412,140
 
Mortgage loans held for sale    
12,614
     
--
     
--
     
12,614
     
12,614
 
Interest receivable    
30,749
     
--
     
30,749
     
--
     
30,749
 
Legacy loans (net of allowance)    
5,168,595
     
--
     
--
     
5,140,768
     
5,140,768
 
Loans acquired (net of allowance)    
1,092,039
     
--
     
--
     
1,086,160
     
1,086,160
 
                                         
Financial liabilities:                                        
Non-interest bearing transaction accounts    
1,669,860
     
--
     
1,669,860
     
--
     
1,669,860
 
Interest bearing transaction accounts and savings deposits    
4,344,779
     
--
     
4,344,779
     
--
     
4,344,779
 
Time deposits    
1,310,951
     
--
     
--
     
1,301,451
     
1,301,451
 
Federal funds purchased and securities sold under agreements to repurchase    
121,687
     
--
     
121,687
     
--
     
121,687
 
Other borrowings    
522,541
     
--
     
526,266
     
--
     
526,266
 
Subordinated debentures    
67,418
     
--
     
62,142
     
--
     
62,142
 
Interest payable    
2,043
     
--
     
2,043
     
--
     
2,043
 
                                         
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