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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Municipal bonds
Dec. 31, 2010
Municipal bonds
Dec. 31, 2011
Corporate bonds
Dec. 31, 2010
Corporate bonds
Mar. 31, 2009
Affiliated mutual funds
Dec. 31, 2011
Affiliated mutual funds
Dec. 31, 2010
Affiliated mutual funds
Dec. 31, 2011
Mortgage-Backed Securities and 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   $ 53,570       $ 16,769     $ 36,801    
Fair value of available for sale securities with fair values below carrying values for 12 months or longer   2,745   2,536         209    
Total temporarily impaired securities   56,315   2,536   16,769     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   (5,451)       (89)     (5,362)    
Unrealized losses on available for sale securities with fair values below carrying values for 12 months or longer   (30)   (13)         (17)    
Total Unrealized losses on temporarily impaired securities   (5,481)   (13)   (89)     (5,379)    
Other than temporary impairment of investments 3,686             3,700      
Maturities of mortgage-backed securities, municipal bonds and corporate bonds accounted for as trading                      
Fair value of trading securities that mature within one year                     5,081
Fair value of trading securities that mature after one year but within 10 years                     12,738
Fair value of trading securities that mature after 10 years                     63
Total fair value of trading securities   38,161 98,836 500 487 17,319 50   20,242 32,070 17,882
Amortized Cost                      
Amortized cost of available for sale debt securities that mature within one year   14,680                  
Amortized cost of available for sale debt securities that mature after one year but within 10 years   32,770                  
Amortized cost of available for sale debt securities that mature after 10 years   1,001                  
Total amortized cost of available for sale debt securities   48,451                  
Fair value                      
Fair value of available for sale debt securities that mature within one year   14,619                  
Fair value of available for sale debt securities that mature after one year but within 10 years   32,913                  
Fair value of available for sale debt securities that mature after 10 years   989                  
Total fair value of available for sale debt securities   $ 48,521