Loans (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loan threshold for jumbo loan qualification	$ 600,000
Troubled debt restructurings included in impaired loans	52,500,000	56,700,000
Annual loan review, exposure on non-homogeneous commercial loan, minimum	2,000,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loan relationships having aggregate balances in excess of	2,000,000
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loan relationships having aggregate balances in excess of	$ 500,000