INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current expense
Federal	$ 11,928	$ 11,830	$ 10,453
State	4,664	5,227	4,268
Total current expense	16,592	17,057	14,721
Deferred expense (benefit)
Federal	(1,183)	548	(2,223)
State	(736)	(457)	(271)
Total deferred expense (benefit)	(1,919)	91	(2,494)
Total expense	$ 14,673	$ 17,148	$ 12,227