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Trading Securities (Trading Securities by Major Type) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities $ 1,841 $ 1,922
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading securities $ 1,841 [1] $ 1,922 [1]
[1] Consists of Government National Mortgage Association (Ginnie Mae) mortgage-backed securities.