Loans Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 353,276	$ 350,310	$ 333,327
Satisfactory [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	78,706	97,085	93,095
Satisfactory [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	33,133	27,913	25,993
Satisfactory [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	241,437	225,312	214,239
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,317	1,611	1,816
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,313	192	279
Special Mention [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,004	1,419	1,537
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	25,588	26,554	27,726
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,098	6,872	7,049
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	827	1,236	1,272
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	18,663	18,446	19,405
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	1,387	0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	1,387	0
Doubtful [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	854,299	789,281	786,749
Performing [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	7,567	6,683	6,856
Performing [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	392,112	348,676	342,811
Performing [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	454,620	433,922	437,082
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,890	3,198	3,333
Nonperforming [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3	1	1
Nonperforming [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	240	424	419
Nonperforming [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 4,647	$ 2,773	$ 2,913