ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
ACCUMULATED OTHER COMPREHENSIVE INCOME [Abstract]
Unrealized loss on securities available for sale without other than temporary impairment, opening balance	$ 7,688	$ 4,285
Unrealized loss on securities available for sale without other than temporary impairment, current period change	886	1,446
Unrealized loss on securities available for sale without other than temporary impairment, closing balance	8,574	5,731
Unrealized loss on securities available for sale with other than temporary impairment, opening balance	(523)	(1,425)
Unrealized loss on securities available for sale with other than temporary impairment, current period changes	335	1,062
Unrealized loss on securities available for sale with other than temporary impairment, closing balance	(188)	(363)
Total unrealized loss on securities available for sale, opening balance	8,386	5,368	7,165	2,860
Total unrealized loss on securities available for sale, current period changes	1,221	2,508
Total unrealized loss on securities available for sale, closing balance	8,386	5,368	7,165	2,860
Unrealized (loss) on defined benefit pension plans, opening balance	(2,026)	(1,510)
Unrealized (loss) on defined benefit pension plansUnrealized (loss) gain on defined benefit pension plans, current period changes	131	(96)
Unrealized (loss) on defined benefit pension plans, closing balance	(1,895)	(1,606)
Total, opening balance	6,491	3,762	5,139	1,350
Total, current period changes	1,352	2,412
Total, closing balance	$ 6,491	$ 3,762	$ 5,139	$ 1,350