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Guarantees, Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Complaints	Mar. 31, 2012
Guarantees, Commitments And Contingencies [Abstract]
Letters of credit, accrued liability	$ 12.6
Reserve for unfunded lending commitments	8.1
Deferred commitment fees	4.5
Guarantee of trust preferred securities issued by affiliated trusts	300
Range of possible loss, minimum	3	3
Range of possible loss, maximum	$ 90	$ 75
Number of complaints related to overdraft fees	3

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.