Loans and Allowance for Loan Losses (Details 5) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Loans by credit quality indicators
Total loans	$ 1,035,288,000	$ 1,072,422,000	$ 1,094,037,000
Commercial and Industrial [Member]
Loans by credit quality indicators
Total loans	271,814,000	260,613,000
Commercial and Industrial [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	168,413,000	163,296,000
Commercial and Industrial [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	98,160,000	89,463,000
Commercial and Industrial [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	5,241,000	7,854,000
Commercial Vacant Land, Land Development, and Residential Construction [Member]
Loans by credit quality indicators
Total loans	56,622,000	61,959,000
Commercial Vacant Land, Land Development, and Residential Construction [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	10,720,000	9,539,000
Commercial Vacant Land, Land Development, and Residential Construction [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	41,356,000	44,946,000
Commercial Vacant Land, Land Development, and Residential Construction [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	4,546,000	7,474,000
Commercial Real Estate - Owner Occupied [Member]
Loans by credit quality indicators
Total loans	276,185,000	271,869,000
Commercial Real Estate - Owner Occupied [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	164,089,000	149,010,000
Commercial Real Estate - Owner Occupied [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	105,684,000	111,921,000
Commercial Real Estate - Owner Occupied [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	6,412,000	10,938,000
Commercial Real Estate - Non-Owner Occupied [Member]
Loans by credit quality indicators
Total loans	299,356,000	334,165,000
Commercial Real Estate - Non-Owner Occupied [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	126,240,000	123,048,000
Commercial Real Estate - Non-Owner Occupied [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	126,341,000	164,049,000
Commercial Real Estate - Non-Owner Occupied [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	46,775,000	47,068,000
Commercial Real Estate - Multi-Family and Residential Rental [Member]
Loans by credit quality indicators
Total loans	53,434,000	68,299,000
Commercial Real Estate - Multi-Family and Residential Rental [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	23,430,000	27,245,000
Commercial Real Estate - Multi-Family and Residential Rental [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	26,740,000	26,278,000
Commercial Real Estate - Multi-Family and Residential Rental [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	3,264,000	14,776,000
Retail home equity and other [Member]
Loans by credit quality indicators
Total loans	39,423,000	42,336,000
Retail 1-4 family mortgages [Member]
Loans by credit quality indicators
Total loans	$ 38,454,000	$ 33,181,000