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Derivatives and hedging activities (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Derivative financial instruments
Sep. 30, 2011
Level 3
Derivative financial instruments
Sep. 30, 2011
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     $ 215 $ (277)
Transfers into/(out of) Level 3     (289) (1,473)
Realized losses included in earnings     37 305
Unrealized gains included in other comprehensive income     0 1,140
Purchases, sales, issuances or settlements     37 305
Balance at the end of the period     $ 0 $ 0
Credit value adjustments, percentage of fair value of derivatives for Level 3 classification greater than 20.00% 20.00%