Loan Quality (Allowance for Loan Losses, by Loan Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	$ 9,627	$ 10,150	$ 9,723	$ 8,801	$ 8,801
Charge-offs	(364)	(3,824)	(3,330)	(5,467)	(7,047)
Recoveries	25	94	120	419	445
Provision	825	2,775	3,600	5,442	7,524
ALL, Ending Balance	10,113	9,195	10,113	9,195	9,723
Residential Real Estate First Liens [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	777	529	1,049	600	600
Charge-offs	(71)	(144)	(251)	(296)	(324)
Recoveries		2		30	30
Provision	157	767	65	820	743
ALL, Ending Balance	863	1,154	863	1,154	1,049
Residential Real Estate Junior Liens & Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	321	313	308	352	352
Charge-offs		(9)	(65)	(186)	(202)
Recoveries		5	25	10	10
Provision	(3)	22	50	155	148
ALL, Ending Balance	318	331	318	331	308
Residential Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	925	2,392	1,222	2,596	2,596
Charge-offs		(1,543)		(2,280)	(2,352)
Provision	(8)		(305)	533	978
ALL, Ending Balance	917	849	917	849	1,222
Commercial, industrial and agricultural real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	5,839	4,644	5,257	3,358	3,358
Charge-offs	(159)	(2,065)	(2,413)	(2,487)	(3,817)
Recoveries	2	61	11	301	306
Provision	269	1,700	3,096	3,168	5,410
ALL, Ending Balance	5,951	4,340	5,951	4,340	5,257
Commercial, industrial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	1,564	1,861	1,651	1,578	1,578
Charge-offs	(73)	(19)	(418)	(60)	(115)
Recoveries	10	7	17	11	11
Provision	359	286	610	606	177
ALL, Ending Balance	1,860	2,135	1,860	2,135	1,651
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, Beginning Balance	201	411	236	317	317
Charge-offs	(61)	(44)	(183)	(158)	(237)
Recoveries	13	19	67	67	88
Provision	51		84	160	68
ALL, Ending Balance	$ 204	$ 386	$ 204	$ 386	$ 236