Fair Value Measurements (Details) (USD $)	3 Months Ended																																		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 U.S. Treasury and other U.S. government obligations	Dec. 31, 2012 U.S. Treasury and other U.S. government obligations	Sep. 30, 2013 Government sponsored enterprise obligations	Dec. 31, 2012 Government sponsored enterprise obligations	Sep. 30, 2013 Mortgage-backed securities	Dec. 31, 2012 Mortgage-backed securities	Sep. 30, 2013 Obligations of states and political subdivisions	Dec. 31, 2012 Obligations of states and political subdivisions	Dec. 31, 2012 Trust preferred securities of financial institutions	Sep. 30, 2013 Recurring basis Fair value	Dec. 31, 2012 Recurring basis Fair value	Dec. 31, 2012 Recurring basis Level 1	Sep. 30, 2013 Recurring basis Level 2	Dec. 31, 2012 Recurring basis Level 2	Sep. 30, 2013 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 Fair value	Sep. 30, 2013 Recurring basis U.S. Treasury and other U.S. government obligations Level 2	Dec. 31, 2012 Recurring basis U.S. Treasury and other U.S. government obligations Level 2	Sep. 30, 2013 Recurring basis Government sponsored enterprise obligations Fair value	Dec. 31, 2012 Recurring basis Government sponsored enterprise obligations Fair value	Sep. 30, 2013 Recurring basis Government sponsored enterprise obligations Level 2	Dec. 31, 2012 Recurring basis Government sponsored enterprise obligations Level 2	Sep. 30, 2013 Recurring basis Mortgage-backed securities Fair value	Dec. 31, 2012 Recurring basis Mortgage-backed securities Fair value	Sep. 30, 2013 Recurring basis Mortgage-backed securities Level 2	Dec. 31, 2012 Recurring basis Mortgage-backed securities Level 2	Sep. 30, 2013 Recurring basis Obligations of states and political subdivisions Fair value	Dec. 31, 2012 Recurring basis Obligations of states and political subdivisions Fair value	Sep. 30, 2013 Recurring basis Obligations of states and political subdivisions Level 2	Dec. 31, 2012 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, 2012 Recurring basis Trust preferred securities of financial institutions Level 1	Sep. 30, 2013 Non-recurring basis	Sep. 30, 2012 Non-recurring basis	Sep. 30, 2013 Non-recurring basis Fair value	Dec. 31, 2012 Non-recurring basis Fair value	Sep. 30, 2013 Non-recurring basis Level 3	Dec. 31, 2012 Non-recurring basis Level 3
Assets
Investment securities available for sale	$ 401,063,000	$ 386,440,000	$ 40,000,000	$ 98,000,000	$ 125,074,000	$ 85,748,000	$ 164,641,000	$ 140,881,000	$ 71,348,000	$ 60,793,000	$ 1,018,000	$ 401,063,000	$ 386,440,000	$ 1,018,000	$ 401,063,000	$ 385,422,000	$ 40,000,000	$ 98,000,000	$ 40,000,000	$ 98,000,000	$ 125,074,000	$ 85,748,000	$ 125,074,000	$ 85,748,000	$ 164,641,000	$ 140,881,000	$ 164,641,000	$ 140,881,000	$ 71,348,000	$ 60,793,000	$ 71,348,000	$ 60,793,000	$ 1,018,000	$ 1,018,000
Interest rate swaps												301,000	415,000		301,000	415,000
Total assets												401,364,000	386,855,000	1,018,000	401,364,000	385,837,000
Liabilities
Interest rate swaps												301,000	415,000		301,000	415,000
Fair Value Measurements
Other real estate owned	6,565,000	7,364,000
Impaired loans with a valuation allowance	13,167,000	15,242,000
Amount of valuation allowance	1,660,000	3,617,000					0	0
Impaired loans	11,500,000	11,600,000																																			11,507,000	11,625,000	11,507,000	11,625,000
Losses																																			(1,181,000)	(1,272,000)
Level 1 to Level 2 transfer, assets	0
Level 2 to Level 1 transfer, assets	0
Level 1 to Level 2 transfer, liabilities	0
Level 2 to Level 1 transfer, liabilities	0
Transfers into/out of Level 3, assets	0
Transfers into/out of Level 3, liabilities	$ 0