Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Cash flow hedges) (Details 2)

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Derivative Financial Instruments (Cash flow hedges) (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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) $ (3,569) $ 3,172 $ 51,943
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 14,992 3,107 (115,692)
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 (114) (2,493) (1,847)
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 (1,432) (45,480) (19,319)
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 2,601 (1,050) (6,744)
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 0
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 0 0 2,580
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) (2,866) 2,469 51,943
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 14,849 3,080 (116,881)
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) 703 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 0
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 0 0 0
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 (2,526) 801 6,108
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 0
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 143 27 (1,391)
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 1,432 45,480 19,319
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 0
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 $ 114 $ 2,493 $ 1,847