Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2002
Summary of Significant Accounting Policies [Abstract]
Contractually past due period for delinquent loans	90 days
Other Real Estate Owned [Abstract]
Other real estate owned	$ 1,062	$ 1,325
Gain or Loss on Sale of Loans and Servicing Rights [Abstract]
Constant prepayment rate (in hundredths)	25.58%	19.87%	18.77%
Discount rate (in hundredths)	11.05%	11.06%	11.06%
Weighted average life	3 years 4 months 28 days	4 years 1 month 24 days	4 years 4 months 13 days
Income Taxes [Abstract]
Equity investment in a partnership			1,000	1,000	1,000	2,355
Period for earning tax credit	10 years
Recapture period of tax credits	15 years
Advertising Costs [Abstract]
Advertising costs	$ 373	$ 576	$ 543
Building and Improvements [Member] | Minimum [Member]
Premises and Equipment [Line Items]
Useful Life	15 years
Building and Improvements [Member] | Maximum [Member]
Premises and Equipment [Line Items]
Useful Life	50 years
Furniture and Equipment [Member] | Minimum [Member]
Premises and Equipment [Line Items]
Useful Life	3 years
Furniture and Equipment [Member] | Maximum [Member]
Premises and Equipment [Line Items]
Useful Life	10 years