Troubled Debt Restructurings (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 loan	Sep. 30, 2011 loan	Sep. 30, 2012 loan	Sep. 30, 2011 loan	Sep. 30, 2012 Troubled Debt Restructurings [Member]	Dec. 31, 2011 Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Modified loans		19	45	34
Extended terms loans			6	17
Interest rate lowered loans			35	15
Period loan is considered to be in default, days			90 days
Total TDRs					$ 21.8	$ 29.1