Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Information relating to loans
NET LOAN BALANCES	$ 1,223,810	$ 1,226,081
Construction and land development [Member]
Information relating to loans
NET LOAN BALANCES	59,626	60,736
Commercial real estate [Member]
Information relating to loans
NET LOAN BALANCES	481,468	486,828
Residential real estate [Member]
Information relating to loans
NET LOAN BALANCES	574,523	569,331
Commercial and financial [Member]
Information relating to loans
NET LOAN BALANCES	64,752	61,903
Consumer [Member]
Information relating to loans
NET LOAN BALANCES	43,248	46,930
Other loans [Member]
Information relating to loans
NET LOAN BALANCES	$ 193	$ 353