Loans Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 333,327	$ 314,163	$ 302,008
Satisfactory [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	93,095	91,555	89,740
Satisfactory [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	25,993	9,195	6,712
Satisfactory [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	214,239	213,413	205,556
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,816	4,433	4,484
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	279	3,975	3,747
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	1,537	458	737
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	27,726	24,427	27,789
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	7,049	4,261	3,544
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,272	1,888	1,930
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	19,405	18,278	22,315
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	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	786,749	784,454	782,859
Performing [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,856	6,312	6,080
Performing [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	342,811	321,888	314,730
Performing [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	437,082	456,254	462,049
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,333	3,980	3,551
Nonperforming [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1	6	0
Nonperforming [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	419	487	495
Nonperforming [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 2,913	$ 3,487	$ 3,056