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Note 6 - Debt and Equity Securities (Tables)
12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
Amortized
Cost
   
Fair Value
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
 
   
(In thousands)
 
Corporate
  $ 90,719     $ 91,273     $ 1,268     $ 714  
Municipals
    145,864       148,896       3,093       61  
Mutual funds
    21,118       21,118       -       -  
Other
    7,098       7,090       -       8  
Total other securities
    264,799       268,377       4,361       783  
REMIC and CMO
    504,207       505,768       6,188       4,627  
GNMA
    13,862       14,159       421       124  
FNMA
    169,956       170,367       2,128       1,717  
FHLMC
    14,505       14,639       142       8  
Total mortgage-backed securities
    702,530       704,933       8,879       6,476  
Total securities available for sale
  $ 967,329     $ 973,310     $ 13,240     $ 7,259  
   
Amortized
Cost
   
Fair Value
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
 
   
(In thousands)
 
Corporate
  $ 100,362     $ 101,711     $ 2,316     $ 967  
Municipals
    127,967       123,423       93       4,637  
Mutual funds
    21,565       21,565       -       -  
Other
    18,160       14,935       -       3,225  
Total other securities
    268,054       261,634       2,409       8,829  
REMIC and CMO
    494,984       489,670       6,516       11,830  
GNMA
    38,974       40,874       2,325       425  
FNMA
    217,615       212,322       2,233       7,526  
FHLMC
    13,297       13,290       226       233  
Total mortgage-backed securities
    764,870       756,156       11,300       20,014  
Total securities available for sale
  $ 1,032,924     $ 1,017,790     $ 13,709     $ 28,843  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
   
Total
   
Less than 12 months
   
12 months or more
 
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
 
   
(In thousands)
 
Corporate
  $ 39,287     $ 714     $ 9,573     $ 428     $ 29,714     $ 286  
Municipals
    8,810       61       3,546       11       5,264       50  
Other
    292       8       -       -       292       8  
Total other securities
    48,389       783       13,119       439       35,270       344  
                                                 
REMIC and CMO
    216,190       4,627       77,382       399       138,808       4,228  
GNMA
    8,358       124       -       -       8,358       124  
FNMA
    95,148       1,717       -       -       95,148       1,717  
FHLMC
    6,773       8       6,773       8       -       -  
Total mortgage-backed securities
    326,469       6,476       84,155       407       242,314       6,069  
Total securities available for sale
  $ 374,858     $ 7,259     $ 97,274     $ 846     $ 277,584     $ 6,413  
   
Total
   
Less than 12 months
   
12 months or more
 
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
   
Fair Value
   
Unrealized
Losses
 
   
(In thousands)
 
Corporate
  $ 39,033     $ 967     $ 39,033     $ 967     $ -     $ -  
Municipals
    100,875       4,637       95,958       4,187       4,917       450  
Other
    6,337       3,225       -       -       6,337       3,225  
Total other securities
    146,245       8,829       134,991       5,154       11,254       3,675  
                                                 
REMIC and CMO
    298,165       11,830       279,743       10,650       18,422       1,180  
GNMA
    9,213       425       9,213       425       -       -  
FNMA
    139,999       7,526       131,248       6,654       8,751       872  
FHLMC
    7,478       233       7,478       233       -       -  
Total mortgage-backed securities
    454,855       20,014       427,682       17,962       27,173       2,052  
Total securities available for sale
  $ 601,100     $ 28,843     $ 562,673     $ 23,116     $ 38,427     $ 5,727  
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
   
For the years ended
December 31,
 
   
2014
   
2013
   
2012
 
   
(In thousands)
 
Beginning balance
  $ 3,738     $ 6,178     $ 6,922  
Recognition of actual losses
    -       (842 )     (1,271 )
OTTI charges due to credit loss recorded in earnings
    -       1,419       776  
Securities sold during the period
    (3,738 )     (3,017 )     (249 )
Ending balance
  $ -     $ 3,738     $ 6,178  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
Cost
   
Fair Value
 
   
(In thousands)
 
             
Due in one year or less
  $ 23,513     $ 23,516  
Due after one year through five years
    35,802       37,050  
Due after five years through ten years
    68,620       68,097  
Due after ten years
    136,864       139,714  
Total other securities
    264,799       268,377  
Mortgage-backed securities
    702,530       704,933  
Total securities available for sale
  $ 967,329     $ 973,310  
Realized Gain (Loss) on Investments [Table Text Block]
   
For the years ended
December 31,
 
   
2014
   
2013
   
2012
 
   
(In thousands)
 
Gross gains from the sale of securities
  $ 5,247     $ 5,222     $ 154  
Gross losses from the sale of securities
    (2,372 )     (2,201 )     (107 )
Net gains from the sale of securities
  $ 2,875     $ 3,021     $ 47