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Securities (Gains (Losses) on the sales of debt securities and credit losses for OTTI of investments) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Gain (Loss) on Investments [Line Items]        
Gross Realized Gains   $ 12,000    
Gross Realized (Losses) (9,000)      
Net Gains (Losses)     (357,000) 664,000
Debt Securities [Member]
       
Gain (Loss) on Investments [Line Items]        
Gross Realized Gains 363,000 626,000 1,183,000 2,495,000
Gross Realized (Losses) (372,000) (614,000) (1,162,000) (1,499,000)
OTTI Credit Losses 0 0 0 (649,000)
Net Gains (Losses) $ (9,000) $ 12,000 $ 21,000 $ 347,000