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Commitments and Contingent Liabilities (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	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
Percentage of Outstanding standby letters of credit collateralized	80.00%
Commitments and Contingent Liabilities (Textuals) [Abstract]
Commitments to sell residential real estate loans	$ 673.5	$ 998.7	$ 1,254.4
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	2.1
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
Standby Letters of Credit [Member] \| Risk Level, Low [Member]
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]
Outstanding standby letters of credit	84
Standby Letters of Credit [Member] \| Risk Level, Medium [Member]
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]
Outstanding standby letters of credit	396
Standby Letters of Credit [Member] \| Risk Level, High [Member]
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]
Outstanding standby letters of credit	68
Standby Letters of Credit [Member]
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]
Carrying amount of deferred revenue associated with guarantees	1.5	2.2	2.0
Outstanding standby letters of credit	$ 548	$ 607	$ 477
Commercial Letters of Credit [Member]
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]
Maturity period of Commercial letters of credit	no longer than 90 days