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Securities (Tables)
12 Months Ended
Dec. 31, 2013
Securities  
Summary of amortized cost and estimated fair value for the major categories of securities available-for-sale and held-to-maturity

 

 

(in thousands)
  Amortized
Cost
  Gross
Unrealized
Gains
  Gross
Unrealized
Losses
  Fair Value  

December 31, 2013

                         

Securities available-for-sale:

                         

U.S. Treasury

  $ 35,312   $ 23   $ —   $ 35,335  

Federal agency—Debt

    1,417,509     938     (7,911 )   1,410,536  

Federal agency—MBS

    156,399     3,615     (2,788 )   157,226  

CMOs—Federal agency

    4,037,348     30,721     (70,771 )   3,997,298  

CMOs—Non-agency

    38,383     127     (1,048 )   37,462  

State and municipal

    407,312     8,806     (123 )   415,995  

Other debt securities

    175,091     3,731     —     178,822  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt securities

    6,267,354     47,961     (82,641 )   6,232,674  

Equity securities and mutual funds

    337     8,106     —     8,443  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

  $ 6,267,691   $ 56,067   $ (82,641 ) $ 6,241,117  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Securities held-to-maturity (1):

                         

Federal agency—Debt

  $ 178,413   $ 133   $ (5,122 ) $ 173,424  

Federal agency—MBS

    445,360     1,005     (11,930 )   434,435  

CMOs—Federal agency

    1,781,219     1,839     (40,621 )   1,742,437  

State and municipal

    454,155     421     (19,014 )   435,562  

Other debt securities

    98,696     —     (619 )   98,077  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities held-to-maturity

  $ 2,957,843   $ 3,398   $ (77,306 ) $ 2,883,935  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

December 31, 2012

                         

Securities available-for-sale:

                         

U.S. Treasury

  $ 20,393   $ 7   $ (3 ) $ 20,397  

Federal agency—Debt

    2,344,374     5,031     (203 )   2,349,202  

Federal agency—MBS

    653,428     39,673     (69 )   693,032  

CMOs—Federal agency

    5,233,126     91,165     (6,038 )   5,318,253  

CMOs—Non-agency

    62,975     662     (2,124 )   61,513  

State and municipal

    437,266     17,447     (239 )   454,474  

Other debt securities

    305,340     7,945     (5,868 )   307,417  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt securities

    9,056,902     161,930     (14,544 )   9,204,288  

Equity securities and mutual funds

    336     1,365     —     1,701  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

  $ 9,057,238   $ 163,295   $ (14,544 ) $ 9,205,989  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Securities held-to-maturity (1):

                         

Federal agency—Debt

  $ 97,183   $ 4,032   $ —   $ 101,215  

Federal agency—MBS

    303,642     11,490     (182 )   314,950  

CMOs—Federal agency

    745,980     28,973     (382 )   774,571  

State and municipal

    251,598     5,122     (857 )   255,863  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities held-to-maturity

  $ 1,398,403   $ 49,617   $ (1,421 ) $ 1,446,599  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

(1)
Securities held-to-maturity are presented in the consolidated balance sheets at amortized cost.
Schedule of gross realized gains and losses on sales and calls of securities (including trading securities) available-for-sale

 

 
  For the year ended December 31,  
(in thousands)
  2013   2012   2011  

Gross realized gains

  $ 27,396   $ 2,259   $ 6,747  

Gross realized losses

    (19,421 )   (1,146 )   (1,681 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net realized gains

  $ 7,975   $ 1,113   $ 5,066  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of remaining maturities of debt securities included in the securities portfolio

The following table provides the expected remaining maturities of debt securities included in the securities portfolio at December 31, 2013, except for mortgage-backed securities which are allocated according to the average life of expected cash flows. 

(in thousands)
  One year
or less
  Over 1 year
through
5 years
  Over 5 years
through
10 years
  Over
10 years
  Total  

Securities available-for-sale:

                               

U.S. Treasury

  $ 12,041   $ 23,294   $ —   $ —   $ 35,335  

Federal agency—Debt

    479,705     872,099     58,732     —     1,410,536  

Federal agency—MBS

    54     95,718     61,454     —     157,226  

CMOs—Federal agency

    111,773     3,452,663     432,862     —     3,997,298  

CMOs—Non-agency

    —     32,182     5,280     —     37,462  

State and municipal

    63,046     349,613     —     3,336     415,995  

Other

    —     178,822     —     —     178,822  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt securities available-for-sale

  $ 666,619   $ 5,004,391   $ 558,328   $ 3,336   $ 6,232,674  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

Amortized cost

  $ 664,211   $ 5,023,953   $ 575,790   $ 3,400   $ 6,267,354  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

Securities held-to-maturity:

                               

Federal agency—Debt

  $ —   $ —   $ 58,639   $ 119,774   $ 178,413  

Federal agency—MBS

    44     30,001     403,869     11,446     445,360  

CMOs—Federal agency

    —     640,808     1,140,411     —     1,781,219  

State and municipal

    —     12,860     194,220     247,075     454,155  

Other

    —     98,696     —     —     98,696  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total debt securities held-to-maturity at amortized cost

  $ 44   $ 782,365   $ 1,797,139   $ 378,295   $ 2,957,843  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       
Schedule of roll forward of credit-related other-than-temporary impairment recognized in earnings for debt securities
 
  For the year ended
December 31,
 
(in thousands)
  2013   2012  

Balance, beginning of period

  $ 16,486   $ 17,531  

Subsequent credit-related impairment

    326     291  

Reduction for securities sold or redeemed

    (12,263 )   (537 )

Reduction for increase in expected cash flows on securities for which OTTI was previously recognized

    —     (799 )
           
​ ​ ​ ​ ​ ​ ​ ​

Balance, end of period

  $ 4,549   $ 16,486  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Summary of the gross unrealized losses and fair value of investment securities that are in an unrealized loss position aggregated by investment category and length of time

 

 
  Less than 12 months   12 months or greater   Total  
(in thousands)
  Fair Value   Estimated
Unrealized
Loss
  Fair Value   Estimated
Unrealized
Loss
  Fair Value   Estimated
Unrealized
Loss
 

December 31, 2013

                                     

Securities available-for-sale:

                                     

Federal agency—Debt

  $ 1,026,142   $ 7,911   $ —   $ —   $ 1,026,142   $ 7,911  

Federal agency—MBS

    17,962     85     43,492     2,703     61,454     2,788  

CMOs—Federal agency

    1,637,994     35,922     728,101     34,849     2,366,095     70,771  

CMOs—Non-agency

    10,056     319     8,483     729     18,539     1,048  

State and municipal

    16,521     39     4,266     84     20,787     123  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

  $ 2,708,675   $ 44,276   $ 784,342   $ 38,365   $ 3,493,017   $ 82,641  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           

Securities held-to-maturity:

                                     

Federal agency—Debt

  $ 156,290   $ 5,122   $ —   $ —   $ 156,290   $ 5,122  

Federal agency—MBS

    321,090     10,513     15,338     1,417     336,428     11,930  

CMOs—Federal agency

    1,539,464     36,435     63,276     4,186     1,602,740     40,621  

State and municipal

    347,305     14,190     41,102     4,824     388,407     19,014  

Other debt securities

    98,077     619     —     —     98,077     619  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities held-to-maturity

  $ 2,462,226   $ 66,879   $ 119,716   $ 10,427   $ 2,581,942   $ 77,306  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           

December 31, 2012

                                     

Securities available-for-sale:

                                     

U.S. Treasury

  $ 5,096   $ 3   $ —   $ —   $ 5,096   $ 3  

Federal agency—Debt

    346,136     203     —     —     346,136     203  

Federal agency—MBS

    50,932     69     46     —     50,978     69  

CMOs—Federal agency

    1,413,367     5,994     13,565     44     1,426,932     6,038  

CMOs—Non-agency

    —     —     25,484     2,124     25,484     2,124  

State and municipal

    85,550     225     810     14     86,360     239  

Other debt securities

    39,877     49     16,038     5,819     55,915     5,868  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities available-for-sale

  $ 1,940,958   $ 6,543   $ 55,943   $ 8,001   $ 1,996,901   $ 14,544  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           

Securities held-to-maturity:

                                     

Federal agency—MBS

  $ 31,514   $ 182   $ —   $ —   $ 31,514   $ 182  

CMOs—Federal agency

    60,998     382     —     —     60,998     382  

State and municipal

    64,344     857     —     —     64,344     857  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities held-to-maturity

  $ 156,856   $ 1,421   $ —   $ —   $ 156,856   $ 1,421  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           

(1)
The estimated gross unrealized loss for federal agency mortgage-backed securities classified as available-for-sale was an insignificant amount as of December 31, 2012.