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Investments held to maturity Investments held to maturity (Tables)
 6 Months Ended
Jun. 25, 2013
Schedule of Held-to-maturity Securities [Line Items]  
Held-to-maturity Securities [Table Text Block]
 
June 25, 2013
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Investments held to maturity:
 
 
 
 
 
 
 
Freddie Mac
$
69,934

 
$
—

 
$
(6
)
 
$
69,928

Federal Home Loan Bank
13,994

 
—

 
—

 
13,994

Fannie Mae
13,991

 
—

 
(1
)
 
13,990

Total
$
97,919

 
$
—

 
$
(7
)
 
$
97,912