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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2013
INVESTMENT SECURITIES  
Schedule of amortized cost, gross unrealized gains and losses, and carrying value of securities available-for-sale

 

 

 
   December 31, 2013  
Security Type
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Carrying
Value		  
 
   (In thousands)
  

Residential mortgage-backed securities:

                          

Government agency and government-sponsored enterprise pass through securities

   $ 691,944   $ 18,012   $ (2,768 ) $ 707,188  

Government agency and government-sponsored enterprise collateralized mortgage obligations

     197,069     388     (4,584 )   192,873  

Covered private label collateralized mortgage obligations

     30,502     7,552     (150 )   37,904  

Municipal securities

     459,182     1,749     (24,273 )   436,658  

Corporate debt securities

     84,119     71     (1,483 )   82,707  

Government-sponsored enterprise debt securities

     10,046     —     (174 )   9,872  

Other securities

     27,654     2     (113 )   27,543  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

   $ 1,500,516   $ 27,774   $ (33,545 ) $ 1,494,745  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   December 31, 2012  
Security Type
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Carrying
Value		  
 
   (In thousands)
  

Residential mortgage-backed securities:

                          

Government agency and government-sponsored enterprise pass through securities

   $ 774,677   $ 33,618   $ (453 ) $ 807,842  

Government agency and government-sponsored enterprise collateralized mortgage obligations

     99,956     1,870     (132 )   101,694  

Covered private label collateralized mortgage obligations

     36,078     8,729     (123 )   44,684  

Municipal securities

     339,547     10,445     (1,951 )   348,041  

Corporate debt securities

     42,014     432     (81 )   42,365  

Other securities

     6,389     4,370     —     10,759  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

   $ 1,298,661   $ 59,464   $ (2,740 ) $ 1,355,385  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of carrying values and the gross unrealized losses on securities by length of time the securities were in an unrealized loss position

 

 
   December 31, 2013  
 
   Less than 12 months   12 months or longer   Total  
Security Type
  Carrying
Value		   Gross
Unrealized
Losses		   Carrying
Value		   Gross
Unrealized
Losses		   Carrying
Value		   Gross
Unrealized
Losses		  
 
   (In thousands)
  

Residential mortgage-backed securities:

                                      

Government agency and government-sponsored enterprise pass through securities

   $ 148,662   $ (2,767 ) $ 32   $ (1 ) $ 148,694   $ (2,768 )

Government agency and government-sponsored enterprise collateralized mortgage obligations

     179,938     (4,486 )   4,383     (98 )   184,321     (4,584 )

Covered private label collateralized mortgage obligations

     1,640     (60 )   617     (90 )   2,257     (150 )

Municipal securities

     337,208     (24,273 )   —     —     337,208     (24,273 )

Corporate debt securities

     72,636     (1,483 )   —     —     72,636     (1,483 )

Government-sponsored enterprise debt securities

     9,872     (174 )   —     —     9,872     (174 )

Other securities

     23,969     (113 )   —     —     23,969     (113 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 773,925   $ (33,356 ) $ 5,032   $ (189 ) $ 778,957   $ (33,545 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           


 

 
   December 31, 2012  
 
   Less than 12 months   12 months or longer   Total  
Security Type
  Carrying
Value		   Gross
Unrealized
Losses		   Carrying
Value		   Gross
Unrealized
Losses		   Carrying
Value		   Gross
Unrealized
Losses		  
 
   (In thousands)
  

Residential mortgage-backed securities:

                                      

Government agency and government-sponsored enterprise pass through securities

   $ 67,299   $ (452 ) $ 60   $ (1 ) $ 67,359   $ (453 )

Government agency and government-sponsored enterprise collateralized mortgage obligations

     18,317     (132 )   —     —     18,317     (132 )

Covered private label collateralized mortgage obligations

     —     —     1,692     (123 )   1,692     (123 )

Municipal securities

     90,303     (1,951 )   —     —     90,303     (1,951 )

Corporate debt securities

     16,819     (81 )   —     —     16,819     (81 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 192,738   $ (2,616 ) $ 1,752   $ (124 ) $ 194,490   $ (2,740 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           
Schedule of contractual maturity distribution of the entity's available-for-sale securities portfolio based on amortized cost and carrying value

 

 

 
   December 31, 2013  
Maturity
  Amortized
Cost		   Carrying
Value		  
 
   (In thousands)
  

Due in one year or less

   $ 5,775   $ 5,792  

Due after one year through five years

     24,597     24,749  

Due after five years through ten years

     131,259     129,985  

Due after ten years

     1,338,885     1,334,219  
           
​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

   $ 1,500,516   $ 1,494,745  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of composition of our interest income on investment securities

 

 

 
   Year Ended December 31,  
 
   2013   2012   2011  

Securities Interest by Type:

                    

Taxable interest

  
$
23,542		  
$
29,652		  
$
33,390		  

Nontaxable interest

     11,777     5,559     1,222  

Dividend income

     1,604     446     173  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total interest income on investment securities

   $ 36,923   $ 35,657   $ 34,785  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​