Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingent Liabilities (Details Textual)

 v2.3.0.11
Commitments and Contingent Liabilities (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Jan. 29, 2008
Jun. 22, 2007
Jan. 19, 2007
Dec. 08, 2006
Jun. 30, 2011
Standby Letters of Credit [Member]
Risk Level, Low [Member]
Jun. 30, 2011
Standby Letters of Credit [Member]
Risk Level, Medium [Member]
Jun. 30, 2011
Standby Letters of Credit [Member]
Risk Level, High [Member]
Jun. 30, 2011
Standby Letters of Credit [Member]
Dec. 31, 2010
Standby Letters of Credit [Member]
Jun. 30, 2010
Standby Letters of Credit [Member]
Jun. 30, 2011
Commercial Letters of Credit [Member]
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]                            
Maturity period of majority of standby letters of credit                     Within 2 years      
Carrying amount of deferred revenue associated with guarantees                     $ 1.5 $ 2.2 $ 2.1  
Outstanding standby letters of credit 600.0             72.4 441.7 58.5 573.0 607.0 516.0  
Maturity period of Commercial letters of credit                           No longer than 90 days
Percentage of Outstanding standby letters of credit collateralized                     79.00%      
Commitments and Contingent Liabilities (Textuals) [Abstract]                            
Commitments to sell residential real estate loans 400.2 998.7 735.1                      
Maturity period of forward contracts relating mortgage banking business Less than one year                          
Gross unrecognized tax benefit 12.5                          
Total interest accrued on the unrecognized tax benefits 2.1                          
Aggregate range of reasonably possible losses current legal proceedings, Min 0                          
Aggregate range of reasonably possible losses current legal proceedings, Max 160.0                          
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       9.7                    
Fraudulent transfers alleged by Teleservices bankruptcy trustee           $ 73.0