Loans Loan Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 350,310	$ 314,163
Satisfactory [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	97,085	91,555
Satisfactory [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	27,913	9,195
Satisfactory [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	225,312	213,413
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,611	4,433
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	192	3,975
Special Mention [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,419	458
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	26,554	24,427
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,872	4,261
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,236	1,888
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	18,446	18,278
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,387	0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,387	0
Doubtful [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	789,281	784,454
Performing [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,683	6,312
Performing [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	348,676	321,888
Performing [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	433,922	456,254
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,198	3,980
Nonperforming [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1	6
Nonperforming [Member] | Automobile [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	424	487
Nonperforming [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 2,773	$ 3,487