Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Recorded Investment	$ 187	$ 192
Impaired Loans with No Allowance: Unpaid Principal Balance	689	870
Impaired Loans with Allowance: Recorded Investment	206	223
Impaired Loans with Allowance: Unpaid Principal Balance	333	351
Impaired Loans with Allowance: Related Allowance	83	111
Impaired Loans: Total Recorded Investment	393	415
Impaired Loans: Total Unpaid Principal Balance	1,022	1,221
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Recorded Investment	6,398	6,570
Impaired Loans with No Allowance: Unpaid Principal Balance	9,832	10,773
Impaired Loans with Allowance: Recorded Investment	4,230	2,514
Impaired Loans with Allowance: Unpaid Principal Balance	4,412	2,672
Impaired Loans with Allowance: Related Allowance	1,580	1,200
Impaired Loans: Total Recorded Investment	10,628	9,084
Impaired Loans: Total Unpaid Principal Balance	14,244	13,445
Commercial real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Recorded Investment	54	54
Impaired Loans with Allowance: Unpaid Principal Balance	54	54
Impaired Loans with Allowance: Related Allowance	28	54
Impaired Loans: Total Recorded Investment	54	54
Impaired Loans: Total Unpaid Principal Balance	54	54
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Recorded Investment	60
Impaired Loans with Allowance: Unpaid Principal Balance	60
Impaired Loans with Allowance: Related Allowance	5
Home equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Recorded Investment	122	124
Impaired Loans with No Allowance: Unpaid Principal Balance	260	261
Impaired Loans with Allowance: Recorded Investment	66	67
Impaired Loans with Allowance: Unpaid Principal Balance	71	71
Impaired Loans with Allowance: Related Allowance	17	18
Impaired Loans: Total Recorded Investment	188	191
Impaired Loans: Total Unpaid Principal Balance	331	332
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Unpaid Principal Balance		578
Impaired Loans: Total Recorded Investment		$ 578