Loans (Troubled Debt Restructurings Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Troubled Debt Restructuring (TDR) [Member]	Dec. 31, 2012 Troubled Debt Restructuring (TDR) [Member]	Mar. 31, 2012 Troubled Debt Restructuring (TDR) [Member]	Mar. 31, 2013 Nonaccrual Status [Member] Troubled Debt Restructuring (TDR) [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 29,477	$ 40,000		$ 16,200	$ 14,700		$ 1,100
Impaired Financing Receivable, Related Allowance	$ 1,679		$ 2,001	$ 490		$ 659