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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Impaired [Line Items]
Beginning Balance	$ 10,202	$ 10,221	$ 10,237	$ 9,602
Charge offs	(10)	(210)	(76)	(218)
Recoveries	2	4	33	631
Provision	0	225	0	225
Ending Balance	10,194	10,240	10,194	10,240
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	2,422	1,747	2,424	1,527
Charge offs	(6)	0	(6)	0
Recoveries	0	0	21	0
Provision	(702)	(55)	(725)	165
Ending Balance	1,714	1,692	1,714	1,692
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	5,333	6,173	5,323	5,972
Charge offs	0	0	(50)	0
Recoveries	0	0	8	0
Provision	455	103	507	304
Ending Balance	5,788	6,276	5,788	6,276
Construction [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	318	449	313	707
Charge offs	0	0	0	0
Recoveries	0	0	0	540
Provision	51	43	56	(755)
Ending Balance	369	492	369	492
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	1,341	1,300	1,532	1,263
Charge offs	0	(207)	0	(207)
Recoveries	0	0	0	85
Provision	(37)	71	(228)	23
Ending Balance	1,304	1,164	1,304	1,164
Installment [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	29	59	113	51
Charge offs	(4)	(3)	(20)	(11)
Recoveries	2	4	4	6
Provision	67	4	(3)	18
Ending Balance	94	64	94	64
Unallocated [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance	759	493	532	82
Charge offs	0	0	0	0
Recoveries	0	0	0	0
Provision	166	59	393	470
Ending Balance	$ 925	$ 552	$ 925	$ 552