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Securities Available for Sale (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Schedule of other-than-temporary impairment  
Cumulative credit losses on investment securities, through December 31, 2011 $ 400
Cumulative credit losses on investment securities   
Additions for credit losses not previously recognized   
Cumulative credit losses on investment securities, through December 31, 2012 $ 400