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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 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 $ 24,475  
Fair value of available for sale securities with fair values below carrying values for 12 months or longer 5,604  
Total temporarily impaired securities 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 (472)  
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer (621)  
Total Unrealized losses on temporarily impaired securities (1,093)  
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Total fair value of trading securities 69,377 36,926
Amortized Cost    
Amortized cost of available for sale debt securities that mature within one year 15,488  
Amortized cost of available for sale debt securities that mature after one year but within 10 years 14,929  
Total amortized cost of available for sale debt securities 30,417  
Fair value    
Fair value of available for sale debt securities that mature within one year 15,529  
Fair value of available for sale debt securities that mature after one year but within 10 years 15,134  
Total fair value of available for sale debt securities 30,663  
Municipal bonds
   
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
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 997  
Total temporarily impaired securities 997  
Continuous unrealized loss position, Gross    
Unrealized losses on available for sale securities with fair values below carrying values for less than 12 months (3)  
Total Unrealized losses on temporarily impaired securities (3)  
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Total fair value of trading securities 12,112 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 23,478  
Fair value of available for sale securities with fair values below carrying values for 12 months or longer 5,604  
Total temporarily impaired securities 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 (621)  
Total Unrealized losses on temporarily impaired securities (1,090)  
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading    
Total fair value of trading securities 56,683 19,007
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 2,531  
Fair value of trading securities that mature after one year but within 10 years 10,126  
Total fair value of trading securities $ 12,657