Loans and Allowance for Loan Losses (Details 6) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loans by credit quality indicators
Total loans	$ 1,041,189,000	$ 1,072,422,000	$ 1,262,630,000
Commercial and Industrial [Member]
Loans by credit quality indicators
Total loans	285,322,000	266,548,000
Commercial and Industrial [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	180,314,000	169,231,000
Commercial and Industrial [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	101,832,000	89,463,000
Commercial and Industrial [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	3,176,000	7,854,000
Commercial Vacant Land, Land Development, and Residential Construction [Member]
Loans by credit quality indicators
Total loans	48,099,000	63,467,000
Commercial Vacant Land, Land Development, and Residential Construction [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	6,526,000	9,539,000
Commercial Vacant Land, Land Development, and Residential Construction [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	37,697,000	46,454,000
Commercial Vacant Land, Land Development, and Residential Construction [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	3,876,000	7,474,000
Commercial Real Estate - Owner Occupied [Member]
Loans by credit quality indicators
Total loans	259,277,000	264,426,000
Commercial Real Estate - Owner Occupied [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	150,467,000	143,075,000
Commercial Real Estate - Owner Occupied [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	102,988,000	110,413,000
Commercial Real Estate - Owner Occupied [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	5,822,000	10,938,000
Commercial Real Estate - Non-Owner Occupied [Member]
Loans by credit quality indicators
Total loans	324,886,000	334,165,000
Commercial Real Estate - Non-Owner Occupied [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	154,127,000	123,048,000
Commercial Real Estate - Non-Owner Occupied [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	128,041,000	164,049,000
Commercial Real Estate - Non-Owner Occupied [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	42,718,000	47,068,000
Commercial Real Estate - Multi-Family and Residential Rental [Member]
Loans by credit quality indicators
Total loans	50,922,000	68,299,000
Commercial Real Estate - Multi-Family and Residential Rental [Member] | Grades 1-4 [Member]
Loans by credit quality indicators
Total loans	24,015,000	27,245,000
Commercial Real Estate - Multi-Family and Residential Rental [Member] | Grades 5-7 [Member]
Loans by credit quality indicators
Total loans	22,082,000	26,278,000
Commercial Real Estate - Multi-Family and Residential Rental [Member] | Grades 8-9 [Member]
Loans by credit quality indicators
Total loans	4,825,000	14,776,000
Retail home equity and other [Member]
Loans by credit quality indicators
Total loans	38,917,000	42,336,000
Retail 1-4 family mortgages [Member]
Loans by credit quality indicators
Total loans	$ 33,766,000	$ 33,181,000