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Trading Securities (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Trading Securities (and Certain Trading Assets) [Table Text Block]
Trading Securities by Major Security Types (in thousands)        
 
March 31, 2013
 
December 31, 2012
 
Fair Value
 
Fair Value
Mortgage-backed securities:
 
 
 
Other U.S. obligation residential mortgage-backed securities (1)
$
1,841

 
$
1,922

Total
$
1,841

 
$
1,922

 
(1)
Consists of Government National Mortgage Association (Ginnie Mae) mortgage-backed securities.
Categories of Investments, Marketable Securities, Trading Securities [Member]
 
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Gain (Loss) on Investments [Table Text Block]
Net Gains (Losses) on Trading Securities (in thousands)
 
Three Months Ended March 31,
 
2013
 
2012
Net gains (losses) on trading securities held at period end
$
1

 
$
(8,586
)
Net losses on securities matured during the period
—

 
(294
)
Net gains (losses) on trading securities
$
1

 
$
(8,880
)