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Note 3 - Investment Securities
3 Months Ended
Mar. 31, 2013
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Note 3:  Investment Securities

The amortized cost, unrealized gains and losses accumulated in other comprehensive income, and fair value of investment securities available for sale follows:

   
Investment Securities Available for Sale
At March 31, 2013
 
   
Amortized
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Fair
Value
 
   
(In thousands)
 
U.S. Treasury securities
  $ 3,516     $ 31     $ -     $ 3,547  
Securities of U.S. Government sponsored entities
    44,236       166       (10 )     44,392  
Residential mortgage-backed securities
    45,756       3,157       (3 )     48,910  
Commercial mortgage-backed securities
    3,827       63       -       3,890  
Obligations of States and political subdivisions
    195,326       13,040       (275 )     208,091  
Residential collateralized mortgage obligations
    268,282       2,140       (509 )     269,913  
Asset-backed securities
    15,686       25       (98 )     15,613  
FHLMC and FNMA stock
    825       4,872       (3 )     5,694  
Corporate securities
    365,847       3,739       (673 )     368,913  
Other securities
    2,058       1,227       (72 )     3,213  
Total
  $ 945,359     $ 28,460     $ (1,643 )   $ 972,176  

The amortized cost, unrealized gains and losses, and fair value of investment securities held to maturity follows:

   
Investment Securities Held to Maturity
At March 31, 2013
 
   
Amortized
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Fair
Value
 
   
(In thousands)
 
Securities of U.S. Government sponsored entities
  $ 2,747     $ 28     $ -     $ 2,775  
Residential mortgage-backed securities
    68,417       1,774       (14 )     70,177  
Obligations of States and political subdivisions
    720,514       18,378       (2,913 )     735,979  
Residential collateralized mortgage obligations
    370,680       6,401       (371 )     376,710  
Total
  $ 1,162,358     $ 26,581     $ (3,298 )   $ 1,185,641  

The amortized cost, unrealized gains and losses accumulated in other comprehensive income, and fair value of investment securities available for sale follows:

   
Investment Securities Available for Sale
At December 31, 2012
 
   
Amortized
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Fair
Value
 
   
(In thousands)
 
U.S. Treasury securities
  $ 3,520     $ 38     $ -     $ 3,558  
Securities of U.S. Government sponsored entities
    49,335       207       (17 )     49,525  
Residential mortgage-backed securities
    53,078       3,855       (1 )     56,932  
Commercial mortgage-backed securities
    4,076       69       -       4,145  
Obligations of States and political subdivisions
    200,769       14,730       (252 )     215,247  
Residential collateralized mortgage obligations
    219,613       1,786       (294 )     221,105  
Asset-backed securities
    16,130       18       (143 )     16,005  
FHLMC and FNMA stock
    824       2,061       (5 )     2,880  
Corporate securities
    250,655       3,009       (826 )     252,838  
Other securities
    2,091       1,370       (60 )     3,401  
Total
  $ 800,091     $ 27,143     $ (1,598 )   $ 825,636  

The amortized cost, unrealized gains and losses, and fair value of investment securities held to maturity follows:

   
Investment Securities Held to Maturity
At December 31, 2012
 
   
Amortized
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Fair
Value
 
   
(In thousands)
 
Securities of U.S. Government sponsored entities
  $ 3,232     $ 43     $ -     $ 3,275  
Residential mortgage-backed securities
    72,807       2,090       (10 )     74,887  
Obligations of States and political subdivisions
    680,802       23,004       (1,235 )     702,571  
Residential collateralized mortgage obligations
    399,200       5,185       (561 )     403,824  
Total
  $ 1,156,041     $ 30,322     $ (1,806 )   $ 1,184,557  

The amortized cost and fair value of investment securities by contractual maturity are shown in the following tables at the dates indicated:

   
At March 31, 2013
 
   
Securities Available
for Sale
   
Securities Held
to Maturity
 
   
Amortized
Cost
   
Fair
Value
   
Amortized
Cost
   
Fair
Value
 
   
(In thousands)
 
Maturity in years:
                       
1 year or less
  $ 79,377     $ 80,036     $ 10,458     $ 10,733  
Over 1 to 5 years
    371,270       375,009       166,385       170,445  
Over 5 to 10 years
    70,880       74,190       265,198       272,601  
Over 10 years
    103,084       111,321       281,220       284,975  
Subtotal
    624,611       640,556       723,261       738,754  
Mortgage-backed securities and residential collateralized mortgage obligations
    317,865       322,713       439,097       446,887  
Other securities
    2,883       8,907       -       -  
Total
  $ 945,359     $ 972,176     $ 1,162,358     $ 1,185,641  

   
At December 31, 2012
 
   
Securities Available
for Sale
   
Securities Held
to Maturity
 
   
Amortized
Cost
   
Fair
Value
   
Amortized
Cost
   
Fair
Value
 
   
(In thousands)
 
Maturity in years:
                       
1 year or less
  $ 40,380     $ 40,686     $ 10,265     $ 10,496  
Over 1 to 5 years
    309,293       312,480       167,162       171,769  
Over 5 to 10 years
    59,817       63,540       227,603       236,608  
Over 10 years
    110,919       120,467       279,004       286,973  
Subtotal
    520,409       537,173       684,034       705,846  
Mortgage-backed securities and residential collateralized mortgage obligations
    276,767       282,182       472,007       478,711  
Other securities
    2,915       6,281       -       -  
Total
  $ 800,091     $ 825,636     $ 1,156,041     $ 1,184,557  

Expected maturities of mortgage-backed securities can differ from contractual maturities because borrowers have the right to call or prepay obligations with or without call or prepayment penalties. In addition, such factors as prepayments and interest rates may affect the yield on the carrying value of mortgage-backed securities. At March 31, 2013 and December 31, 2012, the Company had no high-risk collateralized mortgage obligations as defined by regulatory guidelines.

An analysis of gross unrealized losses of investment securities available for sale follows:

   
Investment Securities Available for Sale
At March 31, 2013
 
   
Less than 12 months
   
12 months or longer
   
Total
 
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
 
   
(In thousands)
 
Securities of U.S. Government sponsored entities
  $ 9,990     $ (10 )   $ -     $ -     $ 9,990     $ (10 )
Residential mortgage-backed securities
    64       (1 )     884       (2 )     948       (3 )
Obligations of States and political subdivisions
    3,107       (23 )     9,030       (252 )     12,137       (275 )
Residential collateralized mortgage obligations
    85,377       (509 )     -       -       85,377       (509 )
Asset-backed securities
    -       -       5,449       (98 )     5,449       (98 )
FHLMC and FNMA stock
    -       -       3       (3 )     3       (3 )
Corporate securities
    68,203       (386 )     19,713       (287 )     87,916       (673 )
Other securities
    -       -       1,928       (72 )     1,928       (72 )
Total
  $ 166,741     $ (929 )   $ 37,007     $ (714 )   $ 203,748     $ (1,643 )

An analysis of gross unrealized losses of investment securities held to maturity follows:

   
Investment Securities Held to Maturity
At March 31, 2013
 
   
Less than 12 months
   
12 months or longer
   
Total
 
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
 
   
(In thousands)
 
Residential mortgage-backed securities
  $ 255     $ -     $ 7,775     $ (14 )   $ 8,030     $ (14 )
Obligations of States and political subdivisions
    153,086       (2,782 )     8,887       (131 )     161,973       (2,913 )
Residential collateralized mortgage obligations
    10,268       (167 )     12,770       (204 )     23,038       (371 )
Total
  $ 163,609     $ (2,949 )   $ 29,432     $ (349 )   $ 193,041     $ (3,298 )

The unrealized losses on the Company’s investment securities were caused by market conditions for these types of investments.  The Company evaluates securities on a quarterly basis including changes in security ratings issued by ratings agencies, changes in the financial condition of the issuer, and, for mortgage-related and asset-backed securities, delinquency and loss information with respect to the underlying collateral, changes in the levels of subordination for the Company’s particular position within the repayment structure, and remaining credit enhancement as compared to expected credit losses of the security. Substantially all of these securities continue to be investment grade rated by one or more major rating agencies. In addition to monitoring credit rating agency evaluations, Management performs its own evaluations regarding the credit worthiness of the issuer or the securitized assets underlying asset backed securities.

The Company does not intend to sell any investments and has concluded that it is more likely than not that it will not be required to sell the investments prior to recovery of the amortized cost basis. Therefore, the Company does not consider these investments to be other-than-temporarily impaired as of March 31, 2013.

The fair values of the investment securities could decline in the future if the general economy deteriorates, credit ratings decline, the issuer’s financial condition deteriorates, or the liquidity for securities declines. As a result, other than temporary impairments may occur in the future.

As of March 31, 2013, $872,470 thousand of investment securities were pledged to secure public deposits, short-term borrowed funds, and term repurchase agreements, compared to $850,421 thousand at December 31, 2012.

An analysis of gross unrealized losses of investment securities available for sale follows:

   
Investment Securities Available for Sale
At December 31, 2012
 
   
Less than 12 months
   
12 months or longer
   
Total
 
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
 
   
(In thousands)
 
                                     
Securities of U.S. Government sponsored entities
  $ 9,983     $ (17 )   $ -     $ -     $ 9,983     $ (17 )
Residential mortgage-backed securities
    103       (1 )     11       -       114       (1 )
Residential collateralized mortgage obligations
    72,803       (294 )     -       -       72,803       (294 )
Obligations of States and political subdivisions
    2,080       (23 )     8,928       (229 )     11,008       (252 )
Asset-backed securities
    -       -       5,828       (143 )     5,828       (143 )
FHLMC and FNMA stock
    -       -       1       (5 )     1       (5 )
Corporate securities
    53,570       (423 )     24,597       (403 )     78,167       (826 )
Other securities
    -       -       1,940       (60 )     1,940       (60 )
Total
  $ 138,539     $ (758 )   $ 41,305     $ (840 )   $ 179,844     $ (1,598 )

An analysis of gross unrealized losses of investment securities held to maturity follows:

   
Investment Securities Held to Maturity
At December 31, 2012
 
   
Less than 12 months
   
12 months or longer
   
Total
 
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
 
   
(In thousands)
 
                                     
Residential mortgage-backed securities
  $ 113     $ -     $ 664     $ (10 )   $ 777     $ (10 )
Residential collateralized mortgage obligations
    26,683       (386 )     9,353       (175 )     36,036       (561 )
Obligations of States and political subdivisions
    69,839       (1,205 )     4,275       (30 )     74,114       (1,235 )
Total
  $ 96,635     $ (1,591 )   $ 14,292     $ (215 )   $ 110,927     $ (1,806 )

The following table provides information about the amount of interest income from taxable and non-taxable investment securities:

   
For the Three Months
Ended March 31,
 
   
2013
   
2012
 
   
(In thousands)
 
Taxable:
           
Mortgage related securities
  $ 3,561     $ 3,364  
Other
    1,974       1,326  
Total taxable
    5,535       4,690  
Tax-exempt
    7,531       7,952  
Total interest income from investment securities
  $ 13,066     $ 12,642