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Note 12 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

March 31, 2015

   

December 31, 2014

 
   

Carrying

           

Carrying

         
   

Amount

   

Fair Value

   

Amount

   

Fair Value

 
   

(In thousands)

 

Financial Assets

                               

Cash and due from banks

  $ 182,159     $ 182,159     $ 176,830     $ 176,830  

Short-term investments

    618,726       618,726       489,614       489,614  

Securities available-for-sale

    1,203,682       1,203,682       1,318,935       1,318,935  

Loans held for sale

    -       -       973       1,225  

Loans, net

    9,057,592       9,001,232       8,740,268       8,688,072  

Investment in Federal Home Loan Bank stock

    25,000       25,000       30,785       30,785  

Warrants

    21       21       27       27  
   

Notional

           

Notional

         
   

Amount

   

Fair Value

   

Amount

   

Fair Value

 

Foreign exchange contracts

  $ 127,172     $ 1,615     $ 167,005     $ 1,876  
                                 

Financial Liabilities

 

Carrying

           

Carrying

         
   

Amount

   

Fair Value

   

Amount

   

Fair Value

 
                                 

Deposits

  $ 9,113,250     $ 9,114,489     $ 8,783,460     $ 8,785,342  

Securities sold under agreements to repurchase

    400,000       422,161       450,000       473,816  

Advances from Federal Home Loan Bank

    485,000       484,983       425,000       424,974  

Other borrowings

    22,482       19,396       19,934       17,978  

Long-term debt

    119,136       60,020       119,136       59,425  
   

Notional

           

Notional

         
   

Amount

   

Fair Value

   

Amount

   

Fair Value

 

Foreign exchange contracts

  $ 158,331     $ 4,959     $ 178,868     $ 5,007  

Interest rate swaps

    299,497       8,610       300,480       4,626  
                                 
   

Notional

           

Notional

         
   

Amount

   

Fair Value

   

Amount

   

Fair Value

 

Off-Balance Sheet Financial Instruments

                         

Commitments to extend credit

  $ 2,027,773     $ (3,740 )   $ 2,071,766     $ (3,442 )

Standby letters of credit

    49,585       (238 )     53,910       (243 )

Other letters of credit

    50,558       (34 )     48,142       (29 )

Bill of lading guarantees

    159       -       108       -  
Schedule of Fair Value of Financial Instruments [Table Text Block]
   

March 31, 2015

 
   

Estimated

                         
   

Fair Value

                         
   

Measurements

   

Level 1

   

Level 2

   

Level 3

 
   

(In thousands)

 

Financial Assets

                               

Cash and due from banks

  $ 182,159     $ 182,159     $ -     $ -  

Short-term investments

    618,726       618,726       -       -  

Securities available-for-sale

    1,203,682       356,104       847,578       -  

Loans, net

    9,001,232       -       -       9,001,232  

Investment in Federal Home Loan Bank stock

    25,000       -       25,000       -  

Warrants

    21       -       -       21  

Financial Liabilities

                               

Deposits

    9,114,489       -       -       9,114,489  

Securities sold under agreements to repurchase

    422,161       -       422,161       -  

Advances from Federal Home Loan Bank

    484,983       -       484,983       -  

Other borrowings

    19,396       -       -       19,396  

Long-term debt

    60,020       -       60,020       -  
   

December 31, 2014

 
   

Estimated

                         
   

Fair Value

                         
   

Measurements

   

Level 1

   

Level 2

   

Level 3

 
   

(In thousands)

 

Financial Assets

                               

Cash and due from banks

  $ 176,830     $ 176,830     $ -     $ -  

Short-term investments

    489,614       489,614       -       -  

Securities available-for-sale

    1,318,935       669,870       649,065       -  

Loans held-for-sale

    1,225       -       -       1,225  

Loans, net

    8,688,072       -       -       8,688,072  

Investment in Federal Home Loan Bank stock

    30,785       -       30,785       -  

Warrants

    27       -       -       27  

Financial Liabilities

                               

Deposits

    8,785,342       -       -       8,785,342  

Securities sold under agreements to repurchase

    473,816       -       473,816       -  

Advances from Federal Home Loan Bank

    424,974       -       424,974       -  

Other borrowings

    17,978       -       -       17,978  

Long-term debt

    59,425       -       59,425       -