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Commitments and Contingencies (Schedule Of Commitments And Contingencies) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]    
Commitments and contingent liabilities      
Commitments To Extend Credit [Member]
   
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 1,472,028  
Commitments To Extend Overdrafts [Member]
   
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 214,636  
Forward Sales Commitments [Member]
   
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 263,566  
Commitments To Originate Loans Held For Sale [Member]
   
Loss Contingencies [Line Items]    
Commitments and contingent liabilities 205,158  
Standby Letters Of Credit [Member]
   
Loss Contingencies [Line Items]    
Commitments and contingent liabilities $ 54,994