Loans and Allowance for Loan Losses (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	$ 1,035,288,000	$ 1,072,422,000	$ 1,094,037,000
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	(3.50%)
Commercial and industrial [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	271,814,000	260,613,000
Loan portfolio classes and segments as a percentage of aggregate loans	26.30%	24.30%
Loans and leases receivable net of deferred income increase decrease percentage	4.30%
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	56,622,000	61,959,000
Loan portfolio classes and segments as a percentage of aggregate loans	5.50%	5.80%
Loans and leases receivable net of deferred income increase decrease percentage	(8.60%)
Real estate - owner occupied [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	276,185,000	271,869,000
Loan portfolio classes and segments as a percentage of aggregate loans	26.60%	25.30%
Loans and leases receivable net of deferred income increase decrease percentage	1.60%
Real estate - non-owner occupied [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	299,356,000	334,165,000
Loan portfolio classes and segments as a percentage of aggregate loans	28.90%	31.20%
Loans and leases receivable net of deferred income increase decrease percentage	(10.40%)
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	53,434,000	68,299,000
Loan portfolio classes and segments as a percentage of aggregate loans	5.20%	6.40%
Loans and leases receivable net of deferred income increase decrease percentage	(21.80%)
Total commercial [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	957,411,000	996,905,000	1,012,973,000
Loan portfolio classes and segments as a percentage of aggregate loans	92.50%	93.00%
Loans and leases receivable net of deferred income increase decrease percentage	(4.00%)
Retail home equity and other [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	39,423,000	42,336,000
Loan portfolio classes and segments as a percentage of aggregate loans	3.80%	3.90%
Loans and leases receivable net of deferred income increase decrease percentage	(6.90%)
Retail 1-4 family mortgages [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	38,454,000	33,181,000
Loan portfolio classes and segments as a percentage of aggregate loans	3.70%	3.10%
Loans and leases receivable net of deferred income increase decrease percentage	15.90%
Total retail [Member]
Components of loan portfolio disaggregated by class of loan and percentage change in total loans
Total loans	$ 77,877,000	$ 75,517,000	$ 81,064,000
Loan portfolio classes and segments as a percentage of aggregate loans	7.50%	7.00%
Loans and leases receivable net of deferred income increase decrease percentage	3.10%