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
Mar. 31, 2012
Dec. 31, 2011
Mar. 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            
Carrying amount of deferred revenue associated with guarantees   $ 4.0          
Percentage of Outstanding standby letters of credit collateralized 80.00%            
Commitments and Contingent Liabilities (Textuals) [Abstract]              
Commitments to sell residential real estate loans 706.6 629.0 360.9        
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 2.4            
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            
Standby Letters of Credit [Member]
             
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]              
Carrying amount of deferred revenue associated with guarantees 1.5   1.7        
Outstanding standby letters of credit 530 586 580        
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 77            
Risk Level, Medium [Member] | Standby Letters of Credit [Member]
             
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]              
Outstanding standby letters of credit 385            
Risk Level, High [Member] | Standby Letters of Credit [Member]
             
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]              
Outstanding standby letters of credit $ 68