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Investment Securities (Details 5)
Jun. 30, 2011
Dec. 31, 2010
Prime Minimum [Member]
   
Summary of ranges used in valuation of non-agency mortgage-backed securities other-than-temporarily impaired    
Estimated lifetime prepayment rates 10.00% 4.00%
Lifetime probability of default rates   3.00%
Lifetime loss severity rates 30.00% 40.00%
Prime Maximum [Member]
   
Summary of ranges used in valuation of non-agency mortgage-backed securities other-than-temporarily impaired    
Estimated lifetime prepayment rates 15.00% 14.00%
Lifetime probability of default rates 3.00% 9.00%
Lifetime loss severity rates 50.00% 55.00%
Prime Average [Member]
   
Summary of ranges used in valuation of non-agency mortgage-backed securities other-than-temporarily impaired    
Estimated lifetime prepayment rates 13.00% 13.00%
Lifetime probability of default rates 2.00% 3.00%
Lifetime loss severity rates 36.00% 41.00%
Non Prime Minimum [Member]
   
Summary of ranges used in valuation of non-agency mortgage-backed securities other-than-temporarily impaired    
Estimated lifetime prepayment rates 1.00% 1.00%
Lifetime probability of default rates 1.00% 1.00%
Lifetime loss severity rates 10.00% 37.00%
Non Prime Maximum [Member]
   
Summary of ranges used in valuation of non-agency mortgage-backed securities other-than-temporarily impaired    
Estimated lifetime prepayment rates 11.00% 12.00%
Lifetime probability of default rates 20.00% 20.00%
Lifetime loss severity rates 70.00% 71.00%
Non Prime Average [Member]
   
Summary of ranges used in valuation of non-agency mortgage-backed securities other-than-temporarily impaired    
Estimated lifetime prepayment rates 7.00% 6.00%
Lifetime probability of default rates 8.00% 8.00%
Lifetime loss severity rates 51.00% 55.00%