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								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Beginning Balance				$ 9,602				$ 8,867	$ 9,602	$ 8,867	$ 8,711
Charge offs									(527)	(2,028)	(4,940)
Recoveries									837	315	20
Provision	100	225	(107)	107	300	1,020	250	878	325	2,448	5,076
Ending Balance	10,237				9,602				10,237	9,602	8,867
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance				1,527				1,272	1,527	1,272
Charge offs										(186)
Recoveries										240
Provision									897	201
Ending Balance	2,424				1,527				2,424	1,527
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance				5,972				5,715	5,972	5,715
Charge offs									(57)	(1,168)
Recoveries									80	15
Provision									(672)	1,410
Ending Balance	5,323				5,972				5,323	5,972
Construction [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance				707				551	707	551
Charge offs										(631)
Recoveries									540
Provision									(934)	787
Ending Balance	313				707				313	707
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance				1,263				1,038	1,263	1,038
Charge offs									(454)	(23)
Recoveries									210	53
Provision									513	195
Ending Balance	1,532				1,263				1,532	1,263
Installment [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance				51				52	51	52
Charge offs									(16)	(20)
Recoveries									7	7
Provision									71	12
Ending Balance	113				51				113	51
Unallocated [Member]
Financing Receivable, Impaired [Line Items]
Beginning Balance				82				239	82	239
Provision									450	(157)
Ending Balance	$ 532				$ 82				$ 532	$ 82