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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2012
Derivative Instruments [Abstract]  
Summary of derivative instruments
                 
    June 30, 2012     December 31, 2011  

Notional amount

   $ 7,851     $ 7,949  

Weighted average pay rate on interest-rate swaps

     3.86 %      3.86 % 

Weighted average receive rate on interest-rate swaps

     0.31 %      0.35 % 

Weighted average maturity (years)

     5.1       5.6  

Fair value of interest-rate swaps

   $ (1,055 )    $ (999 ) 

Fair value of yield maintenance provisions

     1,055       999