Loans (Troubled Debt Restructurings) (Details) (USD $)	12 Months Ended		12 Months Ended	3 Months Ended
	Dec. 31, 2012 contract	Mar. 31, 2013	Dec. 31, 2012 Commercial Real Estate contract	Mar. 31, 2013 Residential Real Estate contract		Mar. 31, 2013 Home Equity Lines of Credit contract		Mar. 31, 2013 Consumer contract
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Recorded Investment Current		$ 300,000
Financing Receivable Modifications Number Of Contracts During Period				6		1		10
Recorded Investment, Pre-Modification				180,000	[1]	25,000	[1]	69,000	[1]
Recorded Investment, Post-Modification				180,000	[1]	25,000	[1]	69,000	[1]
Total Recorded Investment				180,000	[1]	25,000	[1]	69,000	[1]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	3		3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,232,000		$ 1,232,000
Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses	0		0

[1] The amounts shown are inclusive of all partial paydowns and charge-offs. Loans modified in a TDR that were fully paid down, charged-off or foreclosed upon by period end are not reported.