Loans and Allowance for Loan and Lease Losses (Average Recorded Investment Of Impaired Loans And Related Interest Income By Loan Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Average Recorded Investment	$ 196	$ 99
Impaired Loans with Allowance: Average Recorded Investment	206	1,189
Impaired Financing Receivable, Average Recorded Investment, Total	402	1,288
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Average Recorded Investment	6,450	5,755
Impaired Loans with No Allowance: Interest Income Recognized	17
Impaired Loans with Allowance: Average Recorded Investment	4,246	2,797
Impaired Financing Receivable, Average Recorded Investment, Total	10,696	8,552
Impaired Financing Receivable, Interest Income Recognized, Total	17
Commercial real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Average Recorded Investment		129
Impaired Loans with Allowance: Average Recorded Investment	54
Impaired Financing Receivable, Average Recorded Investment, Total	54	129
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	86	17
Impaired Financing Receivable, Average Recorded Investment, Total	86	17
Home equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Average Recorded Investment	123	249
Impaired Loans with Allowance: Average Recorded Investment	67	89
Impaired Financing Receivable, Average Recorded Investment, Total	190	338
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment		585
Impaired Financing Receivable, Average Recorded Investment, Total		$ 585