Loans (Details 8) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loans on nonaccrual status	$ 7,715	$ 7,974
Commercial and Industrial
Loans on nonaccrual status	3,023	4,309
Agricultural
Loans on nonaccrual status	154
Commercial Real Estate
Loans on nonaccrual status	2,001	1,585
Residential Prime
Loans on nonaccrual status	2,021	1,640
Residential Heloc
Loans on nonaccrual status	365	159
Consumer
Loans on nonaccrual status	17	55
Commercial construction and development
Loans on nonaccrual status	1	148
Residential construction and development
Loans on nonaccrual status	$ 133	$ 78