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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Continuous unrealized loss position, Fair Value    
Fair value of available for sale securities with fair values below carrying values for less than 12 months $ 5,800 $ 24,475
Fair value of available for sale securities with fair values below carrying values for 12 months or longer 3,177 5,604
Total temporarily impaired securities 8,977 30,079
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months (1) (472)
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer (49) (621)
Total Unrealized losses on temporarily impaired securities (50) (1,093)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Total fair value of trading securities 70,478 69,377
Amortized Cost    
Amortized cost of available for sale debt securities that mature within one year 18,811  
Amortized cost of available for sale debt securities that mature after one year but within five years 11,379  
Amortized cost of available for sale debt securities that mature after five years but within 10 years 9  
Total amortized cost of available for sale debt securities 30,199  
Fair value    
Fair value of available for sale debt securities that mature within one year 18,850  
Fair value of available for sale debt securities that mature after one year but within five years 11,547  
Fair value of available for sale debt securities that mature after five years but within 10 years 10  
Total fair value of available for sale debt securities 30,407  
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 5,800 997
Total temporarily impaired securities 5,800 997
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months (1) (3)
Total Unrealized losses on temporarily impaired securities (1) (3)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Total fair value of trading securities 12,049 12,112
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   23,478
Fair value of available for sale securities with fair values below carrying values for 12 months or longer 3,177 5,604
Total temporarily impaired securities 3,177 29,082
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months   (469)
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer (49) (621)
Total Unrealized losses on temporarily impaired securities (49) (1,090)
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Total fair value of trading securities 57,838 56,683
Mortgage-Backed Securities and Bonds
   
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Fair value of trading securities that mature within one year 2,504  
Fair value of trading securities that mature after one year but within five years 9,546  
Fair value of trading securities that mature after five years but within 10 years 542  
Total fair value of trading securities $ 12,592