Fair Value Measurements (Details) (USD $)																																								12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 U.S. Treasury and other U.S. government obligations	Dec. 31, 2011 U.S. Treasury and other U.S. government obligations	Dec. 31, 2012 Government sponsored enterprise obligations	Dec. 31, 2011 Government sponsored enterprise obligations	Dec. 31, 2012 Mortgage-backed securities	Dec. 31, 2011 Mortgage-backed securities	Dec. 31, 2012 Obligations of states and political subdivisions	Dec. 31, 2011 Obligations of states and political subdivisions	Dec. 31, 2012 Trust preferred securities of financial institutions	Dec. 31, 2011 Trust preferred securities of financial institutions	Dec. 31, 2012 Recurring basis Fair value	Dec. 31, 2011 Recurring basis Fair value	Dec. 31, 2012 Recurring basis Level 1	Dec. 31, 2011 Recurring basis Level 1	Dec. 31, 2012 Recurring basis Level 2	Dec. 31, 2011 Recurring basis Level 2	Dec. 31, 2012 Recurring basis U.S. Treasury and other U.S. government obligations Fair value	Dec. 31, 2011 Recurring basis U.S. Treasury and other U.S. government obligations Fair value	Dec. 31, 2012 Recurring basis U.S. Treasury and other U.S. government obligations Level 2	Dec. 31, 2011 Recurring basis U.S. Treasury and other U.S. government obligations Level 2	Dec. 31, 2012 Recurring basis Government sponsored enterprise obligations Fair value	Dec. 31, 2011 Recurring basis Government sponsored enterprise obligations Fair value	Dec. 31, 2012 Recurring basis Government sponsored enterprise obligations Level 2	Dec. 31, 2011 Recurring basis Government sponsored enterprise obligations Level 2	Dec. 31, 2012 Recurring basis Mortgage-backed securities Fair value	Dec. 31, 2011 Recurring basis Mortgage-backed securities Fair value	Dec. 31, 2012 Recurring basis Mortgage-backed securities Level 2	Dec. 31, 2011 Recurring basis Mortgage-backed securities Level 2	Dec. 31, 2012 Recurring basis Obligations of states and political subdivisions Fair value	Dec. 31, 2011 Recurring basis Obligations of states and political subdivisions Fair value	Dec. 31, 2012 Recurring basis Obligations of states and political subdivisions Level 2	Dec. 31, 2011 Recurring basis Obligations of states and political subdivisions Level 2	Dec. 31, 2012 Recurring basis Trust preferred securities of financial institutions Fair value	Dec. 31, 2011 Recurring basis Trust preferred securities of financial institutions Fair value	Dec. 31, 2012 Recurring basis Trust preferred securities of financial institutions Level 1	Dec. 31, 2011 Recurring basis Trust preferred securities of financial institutions Level 1	Dec. 31, 2012 Non- recurring basis	Dec. 31, 2011 Non- recurring basis	Dec. 31, 2012 Non- recurring basis Fair value	Dec. 31, 2011 Non- recurring basis Fair value	Dec. 31, 2012 Non- recurring basis Level 3	Dec. 31, 2011 Non- recurring basis Level 3
Assets
Investment securities available for sale	$ 386,440,000	$ 352,185,000		$ 98,000,000	$ 115,001,000	$ 85,748,000	$ 46,186,000	$ 140,881,000	$ 120,495,000	$ 60,793,000	$ 69,501,000	$ 1,018,000	$ 1,002,000	$ 386,440,000	$ 352,185,000	$ 1,018,000	$ 1,002,000	$ 385,422,000	$ 351,183,000	$ 98,000,000	$ 115,001,000	$ 98,000,000	$ 115,001,000	$ 85,748,000	$ 46,186,000	$ 85,748,000	$ 46,186,000	$ 140,881,000	$ 120,495,000	$ 140,881,000	$ 120,495,000	$ 60,793,000	$ 69,501,000	$ 60,793,000	$ 69,501,000	$ 1,018,000	$ 1,002,000	$ 1,018,000	$ 1,002,000
Interest rate swap														415,000	442,000			415,000	442,000
Total assets														386,855,000	352,627,000	1,018,000	1,002,000	385,837,000	351,625,000
Liabilities
Interest rate swap														415,000	442,000			415,000	442,000
Fair Value Measurements
Other real estate owned	7,364,000	7,773,000
Impaired loans with a valuation allowance	15,242,000	12,582,000	7,335,000
Amount of valuation allowance	3,617,000	2,561,000	1,814,000
Impaired loans	11,600,000	10,000,000																																								11,625,000	10,021,000	11,625,000	10,021,000
Losses																																								$ (2,467,000)	$ (1,961,000)