Annual report pursuant to Section 13 and 15(d)

Commitments and Contingent Liabilities (Details Textual)

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Commitments and Contingent Liabilities (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Carrying amount of deferred revenue associated with guarantees $ 1,400,000 $ 1,600,000  
Commitments and Contingent Liabilities (Textuals) [Abstract]      
Commitments to sell residential real estate loans 849,800,000 629,000,000  
Maturity period of forward contracts relating mortgage banking business less than one year    
Gross unrecognized tax benefit 6,246,000 11,896,000 49,506,000
Total interest accrued on the unrecognized tax benefits 2,200,000 2,300,000  
Aggregate range of reasonably possible losses current legal proceedings, Min 0    
Aggregate range of reasonably possible losses current legal proceedings, Max 130,000,000    
Recovery from the bank as a form of unjust enrichment 1,900,000    
Direct damage claimed by Plantiffs 32,000,000    
Additional consequential damages by plantiffs excess of $20.0 million    
Bankruptcy trustee alleging for the amount 70,000,000    
Preferential transfer alleged by bankruptcy trustee 1,200,000    
Fraudulent transfers alleged by Teleservices bankruptcy trustee 73,000,000    
Credit related to recoveries in preference actions filed 4,000,000    
Bankruptcy trustee unable to recover 900,000    
Bankruptcy Court recommended judgment amount in Cyberco case, principal 71,800,000    
Bankruptcy Court recommended judgment amount in Cyberco case, interest 8,800,000    
Operating Leases, Future Minimum Payments Due [Abstract]      
Operating Leases, Future Minimum Payments Due, Current 47,100,000    
Operating Leases, Future Minimum Payments, Due in Two Years 45,100,000    
Operating Leases, Future Minimum Payments, Due in Three Years 42,400,000    
Operating Leases, Future Minimum Payments, Due in Four Years 38,500,000    
Operating Leases, Future Minimum Payments, Due in Five Years 35,500,000    
Operating Leases, Future Minimum Payments, Due Thereafter 208,600,000    
Operating Leases, Future Minimum Payments Due 417,200,000    
Operating Leases, Rent Expense, Net [Abstract]      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Total 13,000,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Next Twelve Months 5,400,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Two Years 3,800,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Three Years 2,300,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Four Years 800,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Five Years 200,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Thereafter 500,000    
Total rental expense for all operating leases 54,700,000 53,500,000 50,300,000
Standby Letters of Credit [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Maturity period of majority of standby letters of credit within two years    
Outstanding standby letters of credit 514,705,000 585,791,000  
Percentage of Outstanding standby letters of credit collateralized 80.00%    
Commercial Letters of Credit [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Maturity period of Commercial letters of credit no longer than 90 days    
Risk Level, Low [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit 93,000,000    
Risk Level, Medium [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit 393,000,000    
Risk Level, High [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit $ 29,000,000