Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Information relating to loans
Loans	$ 1,221,354	$ 1,208,074
Construction and land development [Member]
Information relating to loans
Loans	57,228	49,184
Commercial real estate [Member]
Information relating to loans
Loans	493,616	508,353
Residential real estate [Member]
Information relating to loans
Loans	563,935	546,246
Commercial and financial [Member]
Information relating to loans
Loans	56,220	53,105
Consumer Loan [Member]
Information relating to loans
Loans	50,133	50,611
Other [Member]
Information relating to loans
Loans	$ 222	$ 575