Loans and the Allowance for Loan Losses (Summary of Activity in Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Impaired [Line Items]
Beginning Balance	$ 10,232	$ 9,754	$ 10,237	$ 9,602
Charge offs	(61)	(5)	(66)	(8)
Recoveries	31	579	31	627
Provision	0	107	0	0
Ending Balance	10,202	10,221	10,202	10,221
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	2,083	1,784	2,424	1,527
Charge offs	0	0	0	0
Recoveries	21	0	21	0
Provision		(37)	(23)	220
Ending Balance	2,422	1,747	2,422	1,747
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	5,353	5,876	5,323	5,972
Charge offs	(50)	0	(50)	0
Recoveries	8	0	8	0
Provision	22	297	52	201
Ending Balance	5,333	6,173	5,333	6,173
Construction [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	284	637	313	707
Charge offs	0	0	0	0
Recoveries	0	540	0	540
Provision	34	(728)	5	(798)
Ending Balance	318	449	318	449
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	1,378	1,234	1,532	1,263
Charge offs	0	0	0	0
Recoveries	0	38	0	85
Provision	(37)	28	(191)	(48)
Ending Balance	1,341	1,300	1,341	1,300
Installment [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	103	54	113	51
Charge offs	(11)	(5)	(16)	(8)
Recoveries	2	1	2	2
Provision	(65)	9	(70)	14
Ending Balance	29	59	29	59
Unallocated [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	1,031	169	532	82
Charge offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(272)	324	227	411
Ending Balance	$ 759	$ 493	$ 759	$ 493