Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended				12 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011		Sep. 30, 2011 Scenario, Previously Reported [Member]	Sep. 30, 2011 Scenario, Previously Reported [Member]	Dec. 31, 2011 Scenario, Previously Reported [Member]		Sep. 30, 2012 Scenario, Previously Reported [Member]	Sep. 30, 2012 Real Estate Construction [Member]	Sep. 30, 2012 Real Estate Construction [Member]	Sep. 30, 2012 Consumer Real Estate [Member]	Sep. 30, 2012 Consumer Real Estate [Member]	Sep. 30, 2011 Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2011 Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Consumer Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Commercial Real Estate [Member]	Sep. 30, 2012 Commercial Real Estate [Member]	Sep. 30, 2011 Commercial Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2011 Commercial Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Commercial Real Estate [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Commercial Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Commercial Non Real Estate [Member]	Sep. 30, 2012 Commercial Non Real Estate [Member]	Sep. 30, 2011 Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Sep. 30, 2011 Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Commercial and Industrial [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Public Sector and IDA [Member]		Sep. 30, 2012 Public Sector and IDA [Member]		Sep. 30, 2011 Construction, Development & Other Land [Member] Scenario, Previously Reported [Member]		Sep. 30, 2011 Construction, Development & Other Land [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Construction, Development & Other Land [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Construction, Development & Other Land [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Consumer Non Real Estate [Member]	Sep. 30, 2012 Consumer Non Real Estate [Member]	Sep. 30, 2011 Consumer Non Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2011 Consumer Non Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Consumer Non Real Estate [Member] Scenario, Previously Reported [Member]		Dec. 31, 2011 Consumer Non Real Estate [Member] Scenario, Previously Reported [Member]		Sep. 30, 2012 Unallocated [Member]	Sep. 30, 2012 Unallocated [Member]	Sep. 30, 2011 Unallocated [Member] Scenario, Previously Reported [Member]	Sep. 30, 2011 Unallocated [Member] Scenario, Previously Reported [Member]	Sep. 30, 2012 Unallocated [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Unallocated [Member] Scenario, Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	$ 8,168		$ 8,068						$ 8,494	$ 7,664	$ 7,664		$ 8,719	$ 1,396	$ 1,079	$ 1,910	$ 1,245	$ 1,371	[1]	$ 1,059	[1]	$ 1,215	[1]	$ 1,052	[1]	$ 3,257	$ 3,515	$ 4,333	[1]	$ 4,033	[1]	$ 4,631	[1]	$ 4,511	[1]	$ 909	$ 1,473	$ 1,348	[1]	$ 1,108	[1]	$ 1,242	[1]	$ 1,035	[1]	$ 111		$ 232		$ 636	[1]	$ 749	[1]	$ 1,051	[1]	$ 948	[1]	$ 422	$ 403	$ 483	[1]	$ 586	[1]	$ 461	[1]	$ 401	[1]	$ 163	$ 121	$ 323	$ 129	$ 119	$ 121
Charge-offs	(716)		(2,444)						(446)	(1,205)				(51)	(640)	(33)	(278)	(217)	[1]	(429)	[1]					(592)	(1,329)	(41)	[1]	(301)	[1]					0	(5)	(30)	[1]	(167)	[1]					0		0		(100)	[1]	(100)	[1]					(40)	(192)	(58)	[1]	(208)	[1]					0	0	0	0
Recoveries	24		76						28	64				0	13	0	2	0	[1]	7	[1]					0	0	0	[1]	0	[1]					1	2	0	[1]	1	[1]					0		0		0	[1]	0	[1]					23	59	28	[1]	56	[1]					0	0	0	0
Provision for loan losses	778		2,554						643	2,196				(158)	735	95	1,003	61	[1]	578	[1]					872	1,351	339	[1]	899	[1]					(46)	(606)	(76)	[1]	300	[1]					34		(87)		515	[1]	402	[1]					(5)	130	8	[1]	27	[1]					(14)	28	(204)	(10)
Ending Balance	8,254		8,254				8,068		8,719	8,719	8,068		8,719	1,187	1,187	1,972	1,972	1,215	[1]	1,215	[1]	1,215	[1]	1,052	[1]	3,537	3,537	4,631	[1]	4,631	[1]	4,631	[1]	4,511	[1]	864	864	1,242	[1]	1,242	[1]	1,242	[1]	1,035	[1]	145		145		1,051	[1]	1,051	[1]	1,051	[1]	948	[1]	400	400	461	[1]	461	[1]	461	[1]	401	[1]	149	149	119	119	119	121
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	327		327								1,123			0	0	47	47							0	[1]	44	44							1,014	[1]	236	236							62	[1]	0		0								47	[1]	0	0							0	[1]	0	0				0
Collectively evaluated for impairment	7,927		7,927								6,945			1,187	1,187	1,925	1,925							1,052	[1]	3,493	3,493							3,497	[1]	628	628							973	[1]	145		145								901	[1]	400	400							401	[1]	149	149				121
Total	8,254		8,254				8,068		8,719	8,719	8,068		8,719	1,187	1,187	1,972	1,972	1,215	[1]	1,215	[1]	1,215	[1]	1,052	[1]	3,537	3,537	4,631	[1]	4,631	[1]	4,631	[1]	4,511	[1]	864	864	1,242	[1]	1,242	[1]	1,242	[1]	1,035	[1]	145		145		1,051	[1]	1,051	[1]	1,051	[1]	948	[1]	400	400	461	[1]	461	[1]	461	[1]	401	[1]	149	149	119	119	119	121
Loans [Abstract]
Individually evaluated for impairment	11,965		11,965								12,596			3,623	3,623	949	949							238	[1]	6,859	6,859							9,067	[1]	534	534							139	[1]	0		0								3,152	[1]	0	0							0	[1]	0	0				0
Collectively evaluated for impairment	579,496		579,496								575,874			46,176	46,176	140,464	140,464							109,843	[1]	298,508	298,508							357,507	[1]	35,195	35,195							37,584	[1]	26,589		26,589								41,233	[1]	32,564	32,564							29,707	[1]	0	0				0
Total	591,461		591,461				588,470				588,470			49,799	49,799	141,413	141,413							110,081	[1]	305,367	305,367							366,574	[1]	35,729	35,729							37,723	[1]	26,589		26,589								44,385	[1]	32,564	32,564							29,707	[1]	0	0				0
Ratios for allowance for loan losses [Abstract]
Ratio of allowance for loan losses to the end of period loans, net of unearned income and deferred fees (in hundredths)			1.40%		1.46%		1.37%
Ratio of net charge-offs to average loans, net of unearned income and deferred fees (in hundredths)			0.54%	[2]	0.26%	[2]	0.43%	[2]
Nonperforming assets [Abstract]
Loan Receivable Nonaccrual	3,876		3,876		1,263		1,398
Restructured loans in nonaccrual	2,254		2,254		3,081		3,806
Total nonperforming loans	6,130		6,130		4,344		5,204				5,204	[3]																																		0		0
Other real estate owned, net	1,894		1,894		1,759		1,489
Total nonperforming assets	8,024		8,024		6,103		6,693
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned (in hundredths)	1.35%		1.35%		1.02%		1.13%
Ratio of allowance for loan losses to nonperforming loans (in hundredths)	134.65%	[4]	134.65%	[4]	200.71%	[4]	155.03%	[4]
Summary of loans past due 90 days or more and impaired loans [Abstract]
Loans past due 90 days or more and still accruing	114		114		339		481				481	[3]																																		0		0
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees	0.02%		0.02%		0.06%		0.08%
Accruing restructured loans	2,021		2,021		5,524		3,756
Impaired loans [Abstract]
Impaired loans with no valuation allowance	11,063		11,063		2,286		5,505
Impaired loans with a valuation allowance	902		902		7,754		7,091
Total impaired loans	11,965		11,965		10,040		12,596				12,596	[5]																																		0		0
Valuation allowance	(327)		(327)		(1,829)		(1,123)				(1,123)	[5]																																		0		0
Impaired loans, net of allowance	11,638		11,638		8,211		11,473
Average recorded investment in impaired loans	14,231	[6]	13,831	[6],[7]	7,834	[7]	8,734	[7]			8,734	[5],[6]																																		0	[6]	0	[6]
Interest income recognized on impaired loans, after designation as impaired	106		292		90		141				141	[5]																																		0		0
Amount of income recognized on a cash basis			$ 0		$ 0		$ 0
Number of days loans past due, minimum (in days)			90 days

[1] Segments at September 30, 2011 are reported using the segmentation method in effect for 2011. The Company began reporting under revised segments beginning in 2012.

[2] Net charge-offs are on an annualized basis.

[3] Segments at December 31, 2011 are reported using the segmentation method in effect for 2011. The Company began reporting under revised segments beginning in 2012.

[4] The Company defines nonperforming loans as nonaccrual loans. Loans 90 days or more past due and still accruing and accruing restructured loans are excluded.

[5] Segments and classes at December 31, 2011 are reported using the segmentation method in effect for 2011. The Company began reporting under revised segments beginning in 2012.

[6] Recorded investment includes the unpaid principal balance and any accrued interest and net deferred fees.

[7] Recorded investment includes principal, accrued interest and net deferred fees.