Securities (Tables)
3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Debt Securities

The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity debt securities:

 

     March 31, 2018      December 31, 2017  

(unaudited, in thousands)

   Amortized
Cost
     Gross
Unrealized
Gains
     Gross
Unrealized
Losses
    Estimated
Fair

Value
     Amortized
Cost
     Gross
Unrealized
Gains
     Gross
Unrealized
Losses
    Estimated
Fair

Value
 

Available-for-sale debt securities

                     

U.S. Treasury

   $ 9,900      $ —        $ (6   $ 9,894      $ —        $ —        $ —       $ —    

U.S. Government sponsored entities and agencies

     98,166        1        (1,709     96,458        72,425        24        (606     71,843  

Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

     1,377,904        214        (33,708     1,344,410        954,115        214        (19,407     934,922  

Commerical mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

     144,568        19        (3,661     140,926        116,448        4        (1,585     114,867  

Obligations of states and political subdivisions

     100,531        2,093        (1,193     101,431        102,363        2,927        (460     104,830  

Corporate debt securities

     35,219        170        (131     35,258        35,234        228        (59     35,403  
  

 

 

    

 

 

    

 

 

   

 

 

    

 

 

    

 

 

    

 

 

   

 

 

 

Total available-for-sale debt securities

   $ 1,766,288      $ 2,497      $ (40,408   $ 1,728,377      $ 1,280,585      $ 3,397      $ (22,117   $ 1,261,865  
  

 

 

    

 

 

    

 

 

   

 

 

    

 

 

    

 

 

    

 

 

   

 

 

 

Held-to-maturity debt securities

                     

U.S. Government sponsored entities and agencies

   $ 11,263      $ —        $ (373   $ 10,890      $ 11,465      $ —        $ (325   $ 11,140  

Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

     162,904        301        (4,987     158,218        170,025        544        (2,609     167,960  

Obligations of states and political subdivisions

     798,536        10,510        (5,838     803,208        794,655        17,364        (1,609     810,410  

Corporate debt securities

     33,339        82        (235     33,186        33,355        919        —         34,274  
  

 

 

    

 

 

    

 

 

   

 

 

    

 

 

    

 

 

    

 

 

   

 

 

 

Total held-to-maturity debt securities

   $ 1,006,042      $ 10,893      $ (11,433   $ 1,005,502      $ 1,009,500      $ 18,827      $ (4,543   $ 1,023,784  
  

 

 

    

 

 

    

 

 

   

 

 

    

 

 

    

 

 

    

 

 

   

 

 

 

Total debt securities

   $ 2,772,330      $ 13,390      $ (51,841   $ 2,733,879      $ 2,290,085      $ 22,224      $ (26,660   $ 2,285,649  
  

 

 

    

 

 

    

 

 

   

 

 

    

 

 

    

 

 

    

 

 

   

 

 

 

 

Schedule of Fair Value of Available-for-sale and Held-to-maturity Debt Securities by Contractual Maturity

The following table presents the fair value of available-for-sale and held-to-maturity debt securities by contractual maturity at March 31, 2018. In some instances, the issuers may have the right to call or prepay obligations without penalty prior to the contractual maturity date.

 

     March 31, 2018  

(unaudited, in thousands)

   One Year
or less
     One to
Five Years
     Five to
Ten Years
     After
Ten Years
     Mortgage-backed
securities
     Total  

Available-for-sale debt securities

                 

U.S. Treasury

   $ 9,894      $ —        $ —        $ —        $ —        $ 9,894  

U.S. Government sponsored entities and agencies

     9,945        1,961        16,671        6,864        61,017        96,458  

Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1)

     —          —          —          —          1,344,410        1,344,410  

Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1)

     —          —          —          —          140,926        140,926  

Obligations of states and political subdivisions

     3,686        17,368        40,161        40,216        —          101,431  

Corporate debt securities

     3,991        26,299        4,968        —          —          35,258  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

Total available-for-sale debt securities

   $ 27,516      $ 45,628      $ 61,800      $ 47,080      $ 1,546,353      $ 1,728,377  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

Held-to-maturity debt securities (2)

                 

U.S. Government sponsored entities and agencies

   $ —        $ —        $ —        $ —        $ 10,890      $ 10,890  

Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1)

        —          —          —          158,218        158,218  

Obligations of states and political subdivisions

     6,872        114,768        398,845        282,723        —          803,208  

Corporate debt securities

     —          7,504        25,682        —          —          33,186  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

Total held-to-maturity debt securities

   $ 6,872      $ 122,272      $ 424,527      $ 282,723      $ 169,108      $ 1,005,502  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

Total debt securities

   $ 34,388      $ 167,900      $ 486,327      $ 329,803      $ 1,715,461      $ 2,733,879  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

 

(1) Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
(2)  The held-to-maturity debt securities portfolio is carried at an amortized cost of $1.0 billion.
Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities as well as Gains and Losses on Equity Securities

The following table presents the gross realized gains and losses on sales and calls of available-for-sale and held-to-maturity debt securities, as well as gains and losses on equity securities for the three months ended March 31, 2018 and 2017, respectively.

 

     For the Three
Months Ended
March 31,
 

(unaudited, in thousands)

   2018      2017  

Debt securities:

     

Gross realized gains

   $ 7      $ 12  

Gross realized losses

     (18      —    
  

 

 

    

 

 

 

Net (losses) gains on debt securities

   $ (11    $ 12  
  

 

 

    

 

 

 

Equity securities:

     

Unrealized (losses) gains recognized on securities still held

   $ (28    $ —    

Net realized (losses) gains recognized on securities sold

     —          —    
  

 

 

    

 

 

 

Net (losses) gains on equity securities

   $ (28    $ —    
  

 

 

    

 

 

 

Net securities (losses) gains

   $ (39    $ 12  
  

 

 

    

 

 

 
Schedule of Unrealized Losses on Debt Securities

The following tables provide information on unrealized losses on debt securities that have been in an unrealized loss position for less than twelve months and twelve months or more as of March 31, 2018 and December 31, 2017:

 

    March 31, 2018  
    Less than 12 months     12 months or more     Total  
    Fair     Unrealized     # of     Fair     Unrealized     # of     Fair     Unrealized     # of  

(unaudited, dollars in thousands)

  Value     Losses     Securities     Value     Losses     Securities     Value     Losses     Securities  

U.S. Treasury

  $ 9,894     $ (6     1     $ —       $ —         —       $ 9,894     $ (6     1  

U.S. Government sponsored entities and agencies

    59,280       (1,129     8       41,203       (953     8       100,483       (2,082     16  

Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

    785,806       (13,021     128       602,202       (25,674     195       1,388,008       (38,695     323  

Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

    101,309       (2,780     12       23,376       (881     4       124,685       (3,661     16  

Obligations of states and political subdivisions

    335,762       (4,776     527       72,751       (2,255     152       408,513       (7,031     679  

Corporate debt securities

    35,405       (352     12       1,974       (14     1       37,379       (366     13  
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Total temporarily impaired securities

  $ 1,327,456     $ (22,064     688     $ 741,506     $ (29,777     360     $ 2,068,962     $ (51,841     1,048  
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 
    December 31, 2017  
    Less than 12 months     12 months or more     Total  
    Fair     Unrealized     # of     Fair     Unrealized     # of     Fair     Unrealized     # of  

(unaudited, dollars in thousands)

  Value     Losses     Securities     Value     Losses     Securities     Value     Losses     Securities  

U.S. Government sponsored entities and agencies

  $ 24,776     $ (160     4     $ 42,248     $ (771     8     $ 67,024     $ (931     12  

Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

    423,794       (5,039     87       637,461       (16,977     193       1,061,255       (22,016     280  

Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies

    79,061       (1,089     10       27,852       (496     6       106,913       (1,585     16  

Obligations of states and political subdivisions

    132,831       (852     210       77,554       (1,217     160       210,385       (2,069     370  

Corporate debt securities

    4,015       (19     1       1,948       (40     1       5,963       (59     2  
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Total temporarily impaired securities

  $ 664,477     $ (7,159     312     $ 787,063     $ (19,501     368     $ 1,451,540     $ (26,660     680