Loans Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 323,384	$ 314,163	$ 302,221
Satisfactory [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	93,621	91,555	90,354
Satisfactory [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	15,826	9,195	4,967
Satisfactory [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	213,937	213,413	206,900
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,826	4,433	5,533
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,393	3,975	4,222
Special Mention [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	263
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,433	458	1,048
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	26,573	24,427	24,896
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,280	4,261	2,625
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,802	1,888	1,677
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	19,491	18,278	20,594
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	787,745	784,454	783,521
Performing [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,542	6,312	5,981
Performing [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	333,562	321,888	316,198
Performing [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	447,641	456,254	461,342
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,113	3,980	3,943
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	536	487	512
Nonperforming [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 3,576	$ 3,487	$ 3,431