Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
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) $ (25,792) $ (25,143)
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 24,793 16,511
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 347 579
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 8,758 9,154
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 (594) 5,520
FHLB Advances [Member] | Interest expense other borrowings [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) reclassified from accumulated OCI into earnings (effective portion)   0
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) (25,827) (25,143)
Loan [Member] | Interest and fee income loans and leases [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) reclassified from accumulated OCI into earnings (effective portion) 24,786 16,504
Investment securities [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) 35  
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 533 (5,760)
Subordinated notes
    
Gains and (losses) recognized in other comprehensive income (loss) (OCI) for derivatives designated as effective cash flow hedges    
Amount of gain or (loss) reclassified from accumulated OCI into earnings (effective portion) 7  
Subordinated notes | Interest expense other borrowings [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) reclassified from accumulated OCI into earnings (effective portion)   7
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 (8,758) (9,154)
Other long-term debt | Interest expense other borrowings [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) reclassified from accumulated OCI into earnings (effective portion) 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 $ (347) $ (579)