Premises And Equipment, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Premises And Equipment, Net [Abstract]
Depreciation of premises and equipment	$ 34.9	$ 37.2	$ 36.1
Assets transferred to held for disposition during the period	1.4	1.0
Sale of assets	3.8
Total assets held for disposition	1.8	4.5
Asset write-downs	$ 0.3	$ 3.0