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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2014
INVESTMENT SECURITIES  
Schedule of amortized cost, gross unrealized gains and losses, and carrying value of securities available-for-sale

  March 31, 2014  
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

   $ 560,004   $ 16,204   $ (1,539 ) $ 574,669  

Government agency and government-sponsored enterprise collateralized mortgage obligations

     272,832     762     (3,957 )   269,637  

Covered private label collateralized mortgage obligations

     29,649     8,032     (87 )   37,594  

Municipal securities

     455,437     5,599     (13,103 )   447,933  

Corporate debt securities

     84,210     308     (307 )   84,211  

Government-sponsored enterprise debt securities

     36,180     74     (200 )   36,054  

Other securities

     27,393     37     (55 )   27,375  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

   $ 1,465,705   $ 31,016   $ (19,248 ) $ 1,477,473  
                   
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   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  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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Schedule of carrying values and the gross unrealized losses on securities by length of time the securities were in an unrealized loss position

  March 31, 2014  
 
   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

   $ 119,687   $ (1,381 ) $ 673   $ (158 ) $ 120,360   $ (1,539 )

Government agency and government-sponsored enterprise collateralized mortgage obligations

     218,387     (3,957 )   —     —     218,387     (3,957 )

Covered private label collateralized mortgage obligations

     89     (1 )   1,047     (86 )   1,136     (87 )

Municipal securities

     175,910     (5,984 )   98,152     (7,119 )   274,062     (13,103 )

Corporate debt securities

     37,294     (307 )   —     —     37,294     (307 )

Government-sponsored enterprise debt securities

     25,936     (200 )   —     —     25,936     (200 )

Other securities

     16,550     (55 )   —     —     16,550     (55 )
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 593,853   $ (11,885 ) $ 99,872   $ (7,363 ) $ 693,725   $ (19,248 )
                           
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​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           


 

 
   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 )
                           
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Schedule of contractual maturity distribution of the entity's available-for-sale securities portfolio based on amortized cost and carrying value

  March 31, 2014  
Maturity
  Amortized
Cost		   Carrying
Value		  
 
   (In thousands)
  

Due in one year or less

   $ 3,585   $ 3,587  

Due after one year through five years

     24,390     24,614  

Due after five years through ten years

     266,745     265,949  

Due after ten years

     1,170,985     1,183,323  
           
​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

   $ 1,465,705   $ 1,477,473  
           
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​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of composition of our interest income on investment securities
 
   Three Months Ended  
Securities Interest by Type:
  March 31,
2014		   December 31,
2013		   March 31,
2013		  
 
   (In thousands)
  

Taxable interest

   $ 6,920   $ 6,564   $ 5,563  

Nontaxable interest

     3,328     3,333     2,425  

Dividend income

     575     525     228  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total interest income on investment securities

   $ 10,823   $ 10,422   $ 8,216  
               
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