Loans and Allowance for Loan Losses (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	$ 1,041,189,000	$ 1,072,422,000	$ 1,262,630,000
Loan portfolio classes and segments as a percentage of aggregate loans	100.00%	100.00%
Loans and leases receivable net of deferred income increase decrease percentage	(2.90%)
Commercial and industrial [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	285,322,000	266,548,000
Loan portfolio classes and segments as a percentage of aggregate loans	27.40%	24.80%
Loans and leases receivable net of deferred income increase decrease percentage	7.00%
Vacant land, land development, and residential construction [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	48,099,000	63,467,000
Loan portfolio classes and segments as a percentage of aggregate loans	4.60%	5.90%
Loans and leases receivable net of deferred income increase decrease percentage	(24.20%)
Real estate - owner occupied [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	259,277,000	264,426,000
Loan portfolio classes and segments as a percentage of aggregate loans	24.90%	24.70%
Loans and leases receivable net of deferred income increase decrease percentage	(1.90%)
Real estate - non-owner occupied [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	324,886,000	334,165,000
Loan portfolio classes and segments as a percentage of aggregate loans	31.20%	31.20%
Loans and leases receivable net of deferred income increase decrease percentage	(2.80%)
Real estate - multi-family and residential rental [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	50,922,000	68,299,000
Loan portfolio classes and segments as a percentage of aggregate loans	4.90%	6.40%
Loans and leases receivable net of deferred income increase decrease percentage	(25.40%)
Total commercial [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	968,506,000	996,905,000
Loan portfolio classes and segments as a percentage of aggregate loans	93.00%	93.00%
Loans and leases receivable net of deferred income increase decrease percentage	(2.80%)
Retail home equity and other [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	38,917,000	42,336,000
Loan portfolio classes and segments as a percentage of aggregate loans	3.70%	3.90%
Loans and leases receivable net of deferred income increase decrease percentage	(8.10%)
Retail 1-4 family mortgages [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	33,766,000	33,181,000
Loan portfolio classes and segments as a percentage of aggregate loans	3.30%	3.10%
Loans and leases receivable net of deferred income increase decrease percentage	1.80%
Total retail [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	$ 72,683,000	$ 75,517,000
Loan portfolio classes and segments as a percentage of aggregate loans	7.00%	7.00%
Loans and leases receivable net of deferred income increase decrease percentage	(3.80%)