Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of available for sale securities

The following table summarizes available-for-sale securities held by the Company at September 30, 2016:

                           
    Available-for-Sale Securities  
September 30, 2016   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value  
(in thousands)                          
Obligations of U.S. Government sponsored entities   $ 513,251   $ 13,447   $ 2   $ 526,696  
Obligations of U.S. states and political subdivisions     83,596     1,098     13     84,681  
Mortgage-backed securities – residential, issued by                          
U.S. Government agencies     160,464     1,721     436     161,749  
U.S. Government sponsored entities     591,908     5,202     2,357     594,753  
Non-U.S. Government agencies or sponsored entities     126     0     0     126  
U.S. corporate debt securities     2,500     0     338     2,162  
Total debt securities     1,351,845     21,468     3,146     1,370,167  
Equity securities     1,000     0     56     944  
 Total available-for-sale securities   $ 1,352,845   $ 21,468   $ 3,202   $ 1,371,111  

 

 The following table summarizes available-for-sale securities held by the Company at December 31, 2015:  

                           
    Available-for-Sale Securities  
December 31, 2015   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value  
(in thousands)                          
Obligations of U.S. Government sponsored entities   $ 551,176   $ 3,512   $ 1,795   $ 552,893  
Obligations of U.S. states and political subdivisions     83,981     898     153     84,726  
Mortgage-backed securities – residential, issued by                          
U.S. Government agencies     94,459     1,535     1,316     94,678  
U.S. Government sponsored entities     656,947     3,599     10,449     650,097  
Non-U.S. Government agencies or sponsored entities     192     2     0     194  
U.S. corporate debt securities     2,500     0     338     2,162  
Total debt securities     1,389,255     9,546     14,051     1,384,750  
Equity securities     1,000     0     66     934  
Total available-for-sale securities   $ 1,390,255   $ 9,546   $ 14,117   $ 1,385,684  
Schedule of held to maturity securities

The following table summarizes held-to-maturity securities held by the Company at September 30, 2016:  

 

    Held-to-Maturity Securities  
September 30, 2016   Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value  
(in thousands)                          
Obligations of U.S. Government sponsored entities   $ 132,195   $ 6,592   $ 0   $ 138,787  
Obligations of U.S. states and political subdivisions     12,455     384     0     12,839  
Total held-to-maturity debt securities   $ 144,650   $ 6,976   $ 0   $ 151,626  

  

The following table summarizes held-to-maturity securities held by the Company at December 31, 2015:  

 

    Held-to-Maturity Securities  
December 31, 2015     Amortized
Cost		       Gross
Unrealized
Gains		       Gross
Unrealized
Losses		        Fair Value  
(in thousands)                                
Obligations of U.S. Government sponsored entities   $ 132,482     $ 649     $ 444     $ 132,687  
Obligations of U.S. states and political subdivisions     13,589       414       4       13,999  
Total held-to-maturity debt securities   $ 146,071     $ 1,063     $ 448     $ 146,686  
Schedule of available for sale securities with unrealized losses

The following table summarizes available-for-sale securities that had unrealized losses at September 30, 2016:  

 

    Less than 12 Months   12 Months or Longer   Total  
(in thousands)   Fair Value   Unrealized Losses   Fair Value   Unrealized Losses   Fair Value   Unrealized Losses  
Obligations of U.S. Government sponsored entities   $ 1,347   $ 2   $ 0   $ 0   $ 1,347   $ 2  
Obligations of U.S. states and political subdivisions     8,175     12     754     1     8,929     13  
                                       
Mortgage-backed securities – issued by                                      
U.S. Government agencies     32,598     89     23,615     347     56,213     436  
U.S. Government sponsored entities     92,646     481     131,532     1,876     224,178     2,357  
U.S. corporate debt securities     0     0     2,163     338     2,163     338  
Equity securities     0     0     944     56     944     56  
Total available-for-sale securities   $ 134,766   $ 584   $ 159,008   $ 2,618   $ 293,774   $ 3,202  

    

There were no unrealized losses on held-to-maturity securities for September 30, 2016.

  

The following table summarizes available-for-sale securities that had unrealized losses at December 31, 2015:  

 

    Less than 12 Months   12 Months or Longer   Total  
(in thousands)   Fair Value   Unrealized Losses   Fair Value   Unrealized Losses   Fair Value   Unrealized Losses  
Obligations of U.S. Government sponsored entities   $ 183,697   $ 1,618   $ 5,844   $ 177   $ 189,541   $ 1,795  
Obligations of U.S. states and political subdivisions     25,402     141     3,408     12     28,810     153  
                                       
Mortgage-backed securities – residential, issued by                                      
U.S. Government agencies     32,636     350     30,244     966     62,880     1,316  
U.S. Government sponsored entities     364,420     4,102     176,325     6,347     540,745     10,449  
U.S. corporate debt securities     0     0     2,163     338     2,163     338  
Equity securities     0     0     934     66     934     66  
Total available-for-sale securities   $ 606,155   $ 6,211   $ 218,918   $ 7,906   $ 825,073   $ 14,117  
Schedule held-to-maturity securities with unrealized losses

The following table summarizes held-to-maturity securities that had unrealized losses at December 31, 2015.  

 

    Less than 12 Months   12 Months or Longer   Total  
(in thousands)   Fair Value   Unrealized Losses   Fair Value   Unrealized Losses   Fair Value   Unrealized Losses  
Obligations of U.S. Government sponsored entities   $ 29,671   $ 444   $ 0   $ 0   $ 29,671   $ 444  
                                       
Obligations of U.S. sponsored entities     1,966     4     0     0     1,966     4  
Total held-to-maturity securities   $ 31,637   $ 448   $ 0   $ 0   $ 31,637   $ 448  
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity

The amortized cost and estimated fair value of debt securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-backed securities are shown separately since they are not due at a single maturity date.

 

September 30, 2016              
(in thousands)   Amortized Cost   Fair Value  
Available-for-sale securities:              
Due in one year or less   $ 32,150   $ 32,317  
Due after one year through five years     359,863     367,936  
Due after five years through ten years     196,728     202,923  
Due after ten years     10,606     10,363  
Total     599,347     613,539  
Mortgage-backed securities     752,498     756,628  
Total available-for-sale debt securities   $ 1,351,845   $ 1,370,167  
               
December 31, 2015              
(in thousands)   Amortized Cost   Fair Value  
Available-for-sale securities:              
Due in one year or less   $ 53,936   $ 54,735  
Due after one year through five years     351,462     353,736  
Due after five years through ten years     219,161     218,561  
Due after ten years     13,098     12,749  
Total     637,657     639,781  
Mortgage-backed securities     751,598     744,969  
Total available-for-sale debt securities   $ 1,389,255   $ 1,384,750  

  

September 30, 2016              
(in thousands)   Amortized Cost   Fair Value  
Held-to-maturity securities:              
Due in one year or less   $ 8,798   $ 8,833  
Due after one year through five years     28,281     29,496  
Due after five years through ten years     107,571     113,297  
Total held-to-maturity debt securities   $ 144,650   $ 151,626  
               
December 31, 2015              
(in thousands)   Amortized Cost   Fair Value  
Held-to-maturity securities:              
Due in one year or less   $ 9,249   $ 9,294  
Due after one year through five years     14,069     14,341  
Due after five years through ten years     122,585     122,853  
Due after ten years     168     198  
Total held-to-maturity debt securities   $ 146,071   $ 146,686  
Schedule of trading securities at estimated fair value

The following summarizes trading securities, at estimated fair value, as of:  

 

(in thousands)   09/30/2016   12/31/2015  
               
Obligations of U.S. Government sponsored entities   $ 0   $ 6,601  
Mortgage-backed securities – residential, issued by U.S. Government sponsored entities     0     767  
Total   $ 0   $ 7,368