Other Real Estate Owned (Narrative) (Details) (OREO [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Real Estate Properties [Line Items]
Loss sharing agreements amount, 80% on assets acquired	$ 275.0
80% reimbursement for loss on acquisition	467.2
Minimum [Member]
Real Estate Properties [Line Items]
0% percent for losses on acquisition	275.0
Maximum [Member]
Real Estate Properties [Line Items]
0% percent for losses on acquisition	$ 467.2