Loans And Allowance For Loan Losses (Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 26, 2012 Branch Acquisition [Member]	Dec. 31, 2012 Fixed Rate Residential Mortgage	Dec. 31, 2011 Fixed Rate Residential Mortgage	Dec. 31, 2010 Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Loans sold on secondary market					$ 16,900	$ 28,600	$ 20,100
Gain (loss) on sale of mortgage loans	268	292	106		268	292	106
Foregone interest	1,100	1,100	985
Loans restructured due to credit difficulties that are now performing	4,700	3,300
Allowance for credit Losses related to troubled debt restructuring	494	414
Reduction in historical loss factor component due to change in company's modification of calculating historical loss factors on the net rather than gross charge-offs.	325
Non-residential building operator loans expressed as a percentage of the total commercial real estate loans	29.00%
Lodging loans expressed as a percentage of the total commercial real estate loans	23.00%
Business Acquisition [Line Items]
Gross performing commercial loans acquired in business acquisition				6,000
Fair value mark recognized on commercial loans acquired in business acquisition				$ 317