Loans and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Summary of key information for impaired loans
Unpaid Principal Balance	$ 19,440	$ 21,465
Impaired Loans	15,377	17,588
Impaired loans with related allowance for loan losses	9,251	9,505
Related allowance for loan losses	3,590	3,649
Commercial [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	17,465	19,440
Impaired Loans	13,402	15,563
Impaired loans with related allowance for loan losses	8,109	8,738
Related allowance for loan losses	2,958	3,534
Commercial [Member] | Owner occupied RE [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	1,267	3,071
Impaired Loans	1,267	2,271
Impaired loans with related allowance for loan losses	975	2,116
Related allowance for loan losses	262	398
Commercial [Member] | Non-owner occupied RE [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	6,093	7,497
Impaired Loans	5,583	7,162
Impaired loans with related allowance for loan losses	1,878	2,218
Related allowance for loan losses	577	831
Commercial [Member] | Construction [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	4,634	4,824
Impaired Loans	1,892	2,082
Impaired loans with related allowance for loan losses	1,822	1,075
Related allowance for loan losses	181	213
Commercial [Member] | Business [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	5,471	4,048
Impaired Loans	4,660	4,048
Impaired loans with related allowance for loan losses	3,434	3,329
Related allowance for loan losses	1,938	2,092
Consumer [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	1,975	2,025
Impaired Loans	1,975	2,025
Impaired loans with related allowance for loan losses	1,142	767
Related allowance for loan losses	509	115
Consumer [Member] | Real estate [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	1,070	985
Impaired Loans	1,070	985
Impaired loans with related allowance for loan losses	636	162
Related allowance for loan losses	204	24
Consumer [Member] | Home equity [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	683	770
Impaired Loans	683	770
Impaired loans with related allowance for loan losses	312	605
Related allowance for loan losses	261	91
Consumer [Member] | Construction [Member]
Summary of key information for impaired loans
Unpaid Principal Balance
Impaired Loans
Impaired loans with related allowance for loan losses
Related allowance for loan losses
Consumer [Member] | Other [Member]
Summary of key information for impaired loans
Unpaid Principal Balance	222	270
Impaired Loans	222	270
Impaired loans with related allowance for loan losses	194
Related allowance for loan losses	$ 44