Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of nonperforming assets
Nonaccruing troubled debt restructurings	$ 5,937	$ 4,779
Total nonaccrual loans, including nonaccruing TDRs	10,368	10,264
Other real estate owned	2,555	3,686
Nonaccrual Loans and Other Real Estate	12,923	13,950
Nonperforming assets as a percentage of:
Total assets	1.70%	1.82%
Gross loans	2.09%	2.33%
Total loans over 90 days past due	7,419	8,865
Loans over 90 days past due and still accruing
Accruing troubled debt restructurings	8,569	7,429
Commercial Loan [Member] | Owner occupied RE [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs	599	1,061
Commercial Loan [Member] | Non-owner occupied RE [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs	1,476	1,745
Commercial Loan [Member] | Construction Loans [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs	1,005	1,314
Commercial Loan [Member] | Business [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs	507	503
Consumer Loan [Member] | Real Estate [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs	286	476
Consumer Loan [Member] | Home equity [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs	558	386
Consumer Loan [Member] | Construction Loans [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs
Consumer Loan [Member] | Other [Member]
Summary of nonperforming assets
Total nonaccrual loans, including nonaccruing TDRs