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
Jun. 30, 2013
Dec. 31, 2012
Commercial [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 9,814,313 $ 9,209,094
Consumer [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 6,196,952 6,189,447
Commercial Real Estate [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 767,082 797,605
Standby Letters of Credit [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 457,662 $ 514,705