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Derivatives and hedging activities (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Level 3
    
Reconciliation of beginning and ending balances of liabilities having fair value measurements based on significant unobservable inputs (Level 3)    
Balance at the beginning of the period  $ (277) 
Transfers into Level 3(289) (1,461) 
Realized losses included in earnings37 305 
Unrealized gains included in other comprehensive income  1,140 
Purchases, sales, issuances or settlements37 305 
Balance at the end of the period215 215 
Level 3 | Derivative financial instruments
    
Reconciliation of beginning and ending balances of liabilities having fair value measurements based on significant unobservable inputs (Level 3)    
Balance at the beginning of the period  (277) 
Transfers into Level 3(289) (1,473) 
Realized losses included in earnings37 305 
Unrealized gains included in other comprehensive income  1,140 
Purchases, sales, issuances or settlements37 305 
Balance at the end of the period215 215 
Change in unrealized gains or losses included in earnings    
Derivative financial instruments
    
Reconciliation of beginning and ending balances of liabilities having fair value measurements based on significant unobservable inputs (Level 3)    
Credit value adjustments, percentage of fair value of derivatives for Level 3 classification greater than (as a percent)20.00% 20.00%