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Trading Account Assets (Tables)
12 Months Ended
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]  
Schedule of Trading Account Assets
The following table summarizes trading account assets at December 31, 2012 and 2011, which are reported at fair value.

 
 
December 31,
(in thousands)
 
2012
 
2011
Mortgage-backed securities issued by U.S. Government agencies
 
$
2,171

 
33

Collateralized mortgage obligations issued by U.S. Government sponsored enterprises
 
4,875

 
4,040

All other residential mortgage-backed securities
 
1,159

 
11,748

State and municipal securities
 
451

 
10

Other investments
 
2,446

 
1,035

Total
 
$
11,102

 
16,866