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Note 16 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31, 2017
   
December 31, 2016
 
   
Carrying
   
 
 
 
 
Carrying
   
 
 
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
   
(In thousands)
 
Financial Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
  $
247,056
    $
247,056
    $
218,017
    $
218,017
 
Short-term investments
   
292,745
     
292,745
     
967,067
     
967,067
 
Securities available-for-sale
   
1,333,626
     
1,333,626
     
1,314,345
     
1,314,345
 
Loans held for sale
   
8,000
     
8,000
     
7,500
     
7,500
 
Loans, net
   
12,743,766
     
12,663,049
     
11,077,315
     
11,006,344
 
Investment in Federal Home Loan Bank stock
   
23,085
     
23,085
     
17,250
     
17,250
 
Warrants
   
91
     
91
     
79
     
79
 
   
Notional
   
 
 
 
 
Notional
   
 
 
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
Foreign exchange contracts
  $
108,530
    $
1,832
    $
82,439
    $
1,302
 
Interest rate swaps
   
514,159
     
5,218
     
361,526
     
938
 
Financial Liabilities
 
Carrying
   
 
 
 
 
Carrying
   
 
 
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
                                 
Deposits
  $
12,689,893
    $
12,700,674
    $
11,674,726
    $
11,680,017
 
Securities sold under agreements to repurchase
   
100,000
     
100,163
     
350,000
     
351,989
 
Advances from Federal Home Loan Bank
   
430,000
     
429,482
     
350,000
     
350,062
 
Other borrowings
   
52,885
     
51,075
     
17,662
     
15,944
 
Long-term debt
   
194,136
     
141,865
     
119,136
     
63,169
 
   
Notional
   
 
 
 
 
Notional
   
 
 
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
Option contracts
  $
1,014
    $
9
    $
12,117
    $
121
 
Foreign exchange contracts
   
32,127
     
453
     
89,545
     
3,132
 
Interest rate swaps
   
145,399
     
2,699
     
119,136
     
3,744
 
   
Notional
   
 
 
 
 
Notional
   
 
 
 
   
Amount
   
Fair Value
   
Amount
   
Fair Value
 
Off-Balance Sheet Financial Instruments
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commitments to extend credit
  $
2,366,368
    $
(7,224
)   $
2,062,241
    $
(6,025
)
Standby letters of credit
   
140,814
     
(1,805
)    
75,396
     
(668
)
Other letters of credit
   
27,353
     
(52
)    
37,283
     
(16
)
Bill of lading guarantees
   
24
     
(0
)    
75
     
(0
)
Schedule Of Fair Value Of Financial Instruments [Table Text Block]
   
As of December 31, 2017
 
   
Estimated
   
 
 
 
 
 
 
 
 
 
 
 
   
Fair Value
   
 
 
 
 
 
 
 
 
 
 
 
   
Measurements
   
Level 1
   
Level 2
   
Level 3
 
   
(In thousands)
 
Financial Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
  $
247,056
    $
247,056
    $
-
    $
-
 
Short-term investments
   
292,745
     
292,745
     
-
     
-
 
Securities available-for-sale
   
1,333,626
     
277,622
     
1,056,004
     
-
 
Loans held-for-sale
   
8,000
     
-
     
-
     
8,000
 
Loans, net
   
12,663,049
     
-
     
-
     
12,663,049
 
Investment in Federal Home Loan Bank stock
   
23,085
     
-
     
23,085
     
-
 
Warrants
   
91
     
-
     
-
     
91
 
Financial Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deposits
   
12,700,674
     
-
     
-
     
12,700,674
 
Securities sold under agreement to repurchase
   
100,163
     
-
     
100,163
     
-
 
Advances from Federal Home Loan Bank
   
429,482
     
-
     
429,482
     
-
 
Other borrowings
   
51,075
     
-
     
-
     
51,075
 
Long-term debt
   
141,865
     
-
     
141,865
     
-
 
   
As of December 31, 2016
 
   
Estimated
   
 
 
 
 
 
 
 
 
 
 
 
   
Fair Value
   
 
 
 
 
 
 
 
 
 
 
 
   
Measurements
   
Level 1
   
Level 2
   
Level 3
 
   
(In thousands)
 
Financial Assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash and due from banks
  $
218,017
    $
218,017
    $
-
    $
-
 
Short-term investments
   
967,067
     
967,067
     
-
     
-
 
Securities available-for-sale
   
1,314,345
     
513,376
     
800,969
     
-
 
Loans held-for-sale
   
7,500
     
-
     
-
     
7,500
 
Loans, net
   
11,006,344
     
-
     
-
     
11,006,344
 
Investment in Federal Home Loan Bank stock
   
17,250
     
-
     
17,250
     
-
 
Warrants
   
79
     
-
     
-
     
79
 
Financial Liabilities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deposits
   
11,680,017
     
-
     
-
     
11,680,017
 
Securities sold under agreement to repurchase
   
351,989
     
-
     
351,989
     
-
 
Advances from Federal Home Loan Bank
   
350,062
     
-
     
350,062
     
-
 
Other borrowings
   
15,944
     
-
     
-
     
15,944
 
Long-term debt
   
63,169
     
-
     
63,169
     
-