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, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Maturity period of majority of standby letters of credit within two years      
Carrying amount of deferred revenue associated with guarantees $ 1,600,000 $ 2,200,000    
Maturity period of Commercial letters of credit no longer than 90 days      
Percentage of Outstanding standby letters of credit collateralized 80.00%      
Commitments and Contingent Liabilities (Textuals) [Abstract]        
Commitments to sell residential real estate loans 629,000,000 998,700,000    
Maturity period of forward contracts relating mortgage banking business   less than one year    
Gross unrecognized tax benefit 11,896,000 49,506,000 17,214,000 0
Total interest accrued on the unrecognized tax benefits 2,300,000      
Aggregate range of reasonably possible losses current legal proceedings, Min 0      
Aggregate range of reasonably possible losses current legal proceedings, Max 140,000,000      
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      
Operating Leases, Future Minimum Payments Due [Abstract]        
Operating Leases, Future Minimum Payments Due, Current 44,500,000      
Operating Leases, Future Minimum Payments, Due in Two Years 42,600,000      
Operating Leases, Future Minimum Payments, Due in Three Years 40,400,000      
Operating Leases, Future Minimum Payments, Due in Four Years 38,600,000      
Operating Leases, Future Minimum Payments, Due in Five Years 35,100,000      
Operating Leases, Future Minimum Payments, Due Thereafter 250,200,000      
Operating Leases, Rent Expense, Net [Abstract]        
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals 16,300,000      
Future minimum sublease rental payments expected to be received in current year 5,400,000      
Future minimum sublease rental payments expected to be received in two years 4,500,000      
Future minimum sublease rental payments expected to be received in three years 3,400,000      
Future minimum sublease rental payments expected to be received in four years 2,000,000      
Future minimum sublease rental payments expected to be received in five years 600,000      
Future minimum sublease rental payments expected to be received after five years 400,000      
Total rental expense for all operating leases 53,500,000 50,300,000 49,800,000  
Standby Letters of Credit [Member]
        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit 586,000,000 607,000,000    
Risk Level, Low [Member] | Standby Letters of Credit [Member]
        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit 116,000,000      
Risk Level, Medium [Member] | Standby Letters of Credit [Member]
        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit 411,000,000      
Risk Level, High [Member] | Standby Letters of Credit [Member]
        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit $ 59,000,000