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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Continuous unrealized loss position, Fair Value    
Fair value of available for sale securities with fair values below carrying values for less than 12 months $ 21,535 $ 53,570
Fair value of available for sale securities with fair values below carrying values for 12 months or longer 18,056 2,745
Total temporarily impaired securities 39,591 56,315
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months (345) (5,451)
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer (670) (30)
Total Unrealized losses on temporarily impaired securities (1,015) (5,481)
Total fair value of trading securities 73,986 36,926
Amortized Cost    
Amortized cost of available for sale debt securities that mature within one year 15,617  
Amortized cost of available for sale debt securities that mature after one year but within 10 years 16,387  
Total amortized cost of available for sale debt securities 32,004  
Fair value    
Fair value of available for sale debt securities that mature within one year 15,685  
Fair value of available for sale debt securities that mature after one year but within 10 years 16,634  
Total fair value of available for sale debt securities 32,319  
Municipal bonds
   
Continuous unrealized loss position, Fair Value    
Fair value of available for sale securities with fair values below carrying values for 12 months or longer   2,536
Total temporarily impaired securities   2,536
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer   (13)
Total Unrealized losses on temporarily impaired securities   (13)
Total fair value of trading securities 501 500
Corporate bonds
   
Continuous unrealized loss position, Fair Value    
Fair value of available for sale securities with fair values below carrying values for less than 12 months   16,769
Total temporarily impaired securities   16,769
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months   (89)
Total Unrealized losses on temporarily impaired securities   (89)
Total fair value of trading securities 17,196 17,319
Affiliated mutual funds
   
Continuous unrealized loss position, Fair Value    
Fair value of available for sale securities with fair values below carrying values for less than 12 months 21,535 36,801
Fair value of available for sale securities with fair values below carrying values for 12 months or longer 18,056 209
Total temporarily impaired securities 39,591 37,010
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months (345) (5,362)
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer (670) (17)
Total Unrealized losses on temporarily impaired securities (1,015) (5,379)
Total fair value of trading securities 56,209 19,007
Mortgage-Backed Securities and Bonds
   
Continuous unrealized loss position, Gross    
Fair value of trading securities that mature within one year 5,010  
Fair value of trading securities that mature after one year but within 10 years 12,732  
Total fair value of trading securities $ 17,742