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, 2013
Dec. 31, 2012
Dec. 31, 2011
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Carrying amount of deferred revenue associated with guarantees $ 2,100,000 $ 1,400,000  
Commitments and Contingent Liabilities (Textuals) [Abstract]      
Commitments to sell residential real estate loans 452,600,000 849,800,000  
Maturity period of forward contracts relating mortgage banking business less than one year    
Gross unrecognized tax benefit 704,000 6,246,000 11,896,000
Total interest accrued on the unrecognized tax benefits 100,000 2,200,000  
Aggregate range of reasonably possible losses current legal proceedings, Min 0    
Aggregate range of reasonably possible losses current legal proceedings, Max 120,000,000    
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 48,900,000    
Operating Leases, Future Minimum Payments, Due in Two Years 47,100,000    
Operating Leases, Future Minimum Payments, Due in Three Years 43,100,000    
Operating Leases, Future Minimum Payments, Due in Four Years 40,000,000    
Operating Leases, Future Minimum Payments, Due in Five Years 37,100,000    
Operating Leases, Future Minimum Payments, Due Thereafter 189,000,000    
Operating Leases, Future Minimum Payments Due 405,200,000    
Operating Leases, Rent Expense, Net [Abstract]      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Total 10,100,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Next Twelve Months 4,700,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Two Years 3,000,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Three Years 1,200,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Four Years 500,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Five Years 300,000    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Thereafter 400,000    
Total rental expense for all operating leases 55,300,000 54,700,000 53,500,000
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 439,834,000 514,705,000  
Percentage of Outstanding standby letters of credit collateralized 84.00%    
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 96,000,000    
Risk Level, Medium [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit 343,000,000    
Risk Level, High [Member]
      
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]      
Outstanding standby letters of credit $ 0