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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of Derivative Instruments

Summary information about the derivative instruments is as follows:

 

     2012     2011  

Notional amount

    $ 7,750      $ 7,949   

Weighted average pay rate on interest-rate swaps

      3.86 %      3.86 % 

Weighted average receive rate on interest-rate swaps

      0.24 %      0.35 % 

Weighted average maturity (years)

      4.6        5.6   

Fair value of interest-rate swaps

    $ (990 )    $ (999 ) 

Fair value of yield maintenance provisions

      990        999