Loans Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 342,852	$ 350,310	$ 317,783
Satisfactory [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	82,063	97,085	95,385
Satisfactory [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	26,180	27,913	8,969
Satisfactory [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	234,609	225,312	213,429
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,568	1,611	4,611
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	183	192	2,066
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	1,385	1,419	2,545
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	27,369	26,554	24,890
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,921	6,872	4,702
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,200	1,236	1,845
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	19,248	18,446	18,343
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	789,698	789,281	786,635
Performing [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	7,027	6,683	6,455
Performing [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	353,667	348,676	328,176
Performing [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	429,004	433,922	452,004
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,272	3,198	3,628
Nonperforming [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4	1	15
Nonperforming [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	334	424	500
Nonperforming [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 2,934	$ 2,773	$ 3,113