Annual report pursuant to Section 13 and 15(d)

Commitments and Contingent Liabilities (Details)

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Commitments and Contingent Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Commercial [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 9,209,094 $ 8,006,068
Consumer [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 6,189,447 5,903,840
Commercial Real Estate [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 797,605 609,791
Standby Letters of Credit [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 514,705 $ 585,791