Loans and Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Loan	Sep. 30, 2011 Loan	Sep. 30, 2012 Loan	Sep. 30, 2011 Loan
Information related to loans modified in a TDR
Number of Loans	2	4	14	18
Pre-Modification Recorded Investment	$ 1,570	$ 1,147	$ 5,605	$ 5,024
Post-Modification Recorded Investment	1,570	1,147	5,605	5,024
Commercial real estate [Member]
Information related to loans modified in a TDR
Number of Loans	2	1	10	9
Pre-Modification Recorded Investment	1,570	808	5,321	3,025
Post-Modification Recorded Investment	1,570	808	5,321	3,025
Residential real estate [Member]
Information related to loans modified in a TDR
Number of Loans	0	1	2	1
Pre-Modification Recorded Investment	0	204	189	204
Post-Modification Recorded Investment	0	204	189	204
Consumer [Member]
Information related to loans modified in a TDR
Number of Loans	0	2	2	4
Pre-Modification Recorded Investment	0	135	95	779
Post-Modification Recorded Investment	0	135	95	779
Commercial [Member]
Information related to loans modified in a TDR
Number of Loans			0	4
Pre-Modification Recorded Investment			0	1,016
Post-Modification Recorded Investment			$ 0	$ 1,016