Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingent Liabilities (Details)

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Commitments and Contingent Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Commercial [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 9,163,138 $ 9,209,094
Consumer [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 6,270,988 6,189,447
Commercial Real Estate [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 758,756 797,605
Standby Letters of Credit [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 478,801 $ 514,705