Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingent Liabilities (Details Textual)

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Commitments and Contingent Liabilities (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jan. 29, 2008
Jun. 22, 2007
Jan. 19, 2007
Dec. 08, 2006
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]            
Maturity period of majority of standby letters of credit within two years          
Commitments and Contingent Liabilities (Textuals) [Abstract]            
Commitments to sell residential real estate loans $ 938.9 $ 629.0        
Maturity period of forward contracts relating mortgage banking business less than one year          
Gross unrecognized tax benefit 11.9          
Total interest accrued on the unrecognized tax benefits 2.6          
Aggregate range of reasonably possible losses current legal proceedings, Min 0          
Aggregate range of reasonably possible losses current legal proceedings, Max 150.0          
Recovery from the bank as a form of unjust enrichment       1.9    
Direct damage claimed by Plantiffs       32.0    
Additional consequential damages by plantiffs       excess of $20.0 million    
Bankruptcy trustee alleging for the amount           70.0
Preferential transfer alleged by bankruptcy trustee     1.2      
Fraudulent transfers alleged by Teleservices bankruptcy trustee         73.0  
Credit related to recoveries in preference actions filed 4.0          
Bankruptcy trustee unable to recover 0.9          
Standby Letters of Credit [Member]
           
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]            
Carrying amount of deferred revenue associated with guarantees 1.4 1.6        
Outstanding standby letters of credit 531 586        
Percentage of Outstanding standby letters of credit collateralized 82.00%          
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] | Standby Letters of Credit [Member]
           
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]            
Outstanding standby letters of credit 69          
Risk Level, Medium [Member] | Standby Letters of Credit [Member]
           
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]            
Outstanding standby letters of credit 407          
Risk Level, High [Member] | Standby Letters of Credit [Member]
           
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]            
Outstanding standby letters of credit $ 55