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Securities (Details 6) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of cumulative credit related component of OTTI        
BALANCE AT BEGINNING OF PERIOD $ (10,847) $ (10,704) $ (10,771) $ (10,528)
ADD:        
Incurred on Securities not Previously Impaired            
Incurred on Securities Previously Impaired    (28) (76) (204)
LESS:        
Realized Gain/Loss on Sale of Securities            
Reclassification Due to Changes in Company's Intent            
Increases in Cash Flow Expected to be Collected            
BALANCE AT END OF PERIOD $ (10,847) $ (10,732) $ (10,847) $ (10,732)