Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Fair value hedges) (Details 2)

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Derivative Financial Instruments (Fair value hedges) (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) $ 3,172 $ 51,943 $ (66,600)
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 3,107 (115,692) 125,096
Hedged Other long term debt [Member] | Interest expense subordinated notes and other long term debt [Member]
      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (2,493) (1,847) 6,201
Hedged Subordinated notes [Member] | Interest expense subordinated notes and other long term debt [Member]
      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (45,480) (19,319) 99,913
Hedged Deposits [Member] | Interest expense deposits [Member]
      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges (1,050) (6,744) 9,417
FHLB Advances [Member] | Cash flow hedging [Member]
      
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 0 0 1,338
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 0 2,580 6,890
Loan [Member] | Cash flow hedging [Member]
      
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 2,469 51,943 (68,365)
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 3,080 (116,881) 117,669
Investment securities [Member] | Cash flow hedging [Member]
      
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 703 0 0
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 0 0 0
Deposits [Member] | Cash flow hedging [Member]
      
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 0 0 326
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 0 0 4,153
Deposits [Member] | Interest expense deposits [Member]
      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 801 6,108 1,430
Subordinated notes | Cash flow hedging [Member]
      
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 0 0 101
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 27 (1,391) (2,717)
Subordinated notes | Interest expense subordinated notes and other long term debt [Member]
      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges 45,480 19,319 (99,913)
Other long-term debt | Cash flow hedging [Member]
      
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges      
Amount of gain or (loss) recognized in OCI on derivatives (effective portion) 0 0 0
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 0 0 (899)
Other long-term debt | Interest expense subordinated notes and other long term debt [Member]
      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges      
Increase or (decrease) to interest expense for derivatives designated as fair value hedges $ 2,493 $ 1,847 $ (6,201)