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Derivatives and Hedging Activities (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) in OCI on derivatives (effective portion), net of tax $ 765 $ (1,227) $ 763 $ (1,196)
Derivatives designated as hedges [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) in OCI on derivatives (effective portion), net of tax 765 (1,227) 763 (1,196)
Effect of derivative financial instruments included in OCI and current earnings        
Loss reclassified from OCI into interest expense (effective portion) (1,443) (1,346) (2,859) (2,638)
Loss recognized in income on derivatives (ineffective portion & amount excluded from effectiveness testing)            
Derivatives not designated as hedges [Member]
       
Effect of derivative financial instruments included in OCI and current earnings        
Changes in fair value of customer related positions (42) 42 (55) 54
Other Income [Member] | Derivatives not designated as hedges [Member]
       
Effect of derivative financial instruments included in OCI and current earnings        
Changes in fair value of customer related positions 14 51 26 73
Interest Expense [Member] | Derivatives designated as hedges [Member]
       
Effect of derivative financial instruments included in OCI and current earnings        
Loss recognized in income on derivatives (ineffective portion & amount excluded from effectiveness testing)            
Other Expense [Member] | Derivatives designated as hedges [Member]
       
Effect of derivative financial instruments included in OCI and current earnings        
Loss recognized in income on derivatives (ineffective portion & amount excluded from effectiveness testing)            
Other Expense [Member] | Derivatives not designated as hedges [Member]
       
Effect of derivative financial instruments included in OCI and current earnings        
Changes in fair value of customer related positions $ (56) $ (9) $ (81) $ (19)