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Securities (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Schedule of Equity Method Investments [Line Items]      
OTTI Recognized $ 406 $ 406  
Securities (Textual) [Abstract]      
Rate of Risk Ratio   6.00%  
Rate of non-performing assets to loans plus real estate owned ratio   10.00%  
Proceeds from the sale of securities   767,000 5,000
Gross realized gains from the sale of securities   267,000 532,000
Credit Related OTTI [Member]
     
Schedule of Equity Method Investments [Line Items]      
OTTI Recognized   31,000  
Equity method investments,book value 503,000 503,000  
Non Credit Related OTTI [Member]
     
Schedule of Equity Method Investments [Line Items]      
OTTI Recognized   375,000  
Pooled Trust Preferred Security [Member] | Credit Related OTTI [Member]
     
Schedule of Equity Method Investments [Line Items]      
OTTI Recognized   4,800  
Equity method investments,book value $ 26,000 $ 26,000