Loans (Troubled Debt Restructurings Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Troubled Debt Restructuring (TDR) [Member]	Dec. 31, 2011 Troubled Debt Restructuring (TDR) [Member]	Sep. 30, 2012 Nonaccrual Status [Member] Troubled Debt Restructuring (TDR) [Member]	Dec. 31, 2011 Nonaccrual Status [Member] Troubled Debt Restructuring (TDR) [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 37,251	$ 38,137	$ 39,381	$ 36,608	$ 18,900	$ 21,100	$ 1,600	$ 3,600