Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Recorded Investment	$ 34	$ 192
Impaired Loans with No Allowance: Unpaid Principal Balance	70	870
Impaired Loans with Allowance: Recorded Investment	204	223
Impaired Loans with Allowance: Unpaid Principal Balance	331	351
Impaired Loans with Allowance: Related Allowance	82	111
Impaired Loans: Total Recorded Investment	238	415
Impaired Loans: Total Unpaid Principal Balance	401	1,221
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Recorded Investment	4,795	6,570
Impaired Loans with No Allowance: Unpaid Principal Balance	7,818	10,773
Impaired Loans with Allowance: Recorded Investment	9,111	2,514
Impaired Loans with Allowance: Unpaid Principal Balance	9,313	2,672
Impaired Loans with Allowance: Related Allowance	1,871	1,200
Impaired Loans: Total Recorded Investment	13,906	9,084
Impaired Loans: Total Unpaid Principal Balance	17,131	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	84
Impaired Loans with Allowance: Unpaid Principal Balance	84
Impaired Loans with Allowance: Related Allowance	29
Home equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Recorded Investment	121	124
Impaired Loans with No Allowance: Unpaid Principal Balance	260	261
Impaired Loans with Allowance: Recorded Investment	54	67
Impaired Loans with Allowance: Unpaid Principal Balance	54	71
Impaired Loans with Allowance: Related Allowance	10	18
Impaired Loans: Total Recorded Investment	175	191
Impaired Loans: Total Unpaid Principal Balance	314	332
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans with No Allowance: Unpaid Principal Balance		578
Impaired Loans: Total Recorded Investment		$ 578