ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ (3,857)
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	136
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax and Reclassification Adjustments	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(12)
Other Comprehensive Income (Loss) Before Tax and Reclassification Adjustments	(3,733)
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]
Reclassifications Adjustments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	1,536
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	(66)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(715)
Other Comprehensive Income (Loss), Reclassification, Foreign Currency Transaction	0
Accumulated Other Comprehensive Income, Reclassification, total, before tax	755
Transactions Pre-tax
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax, Net of Reclassification Adjustments	(5,393)	3,919
Unrealized loss on derivatives	202
Unfunded pension obligation	715	570
Foreign currency translation	(12)	9
Total	(4,488)	4,498
Transactions Tax-effect
Unrealized gain on securities available-for-sale	2,036	(1,480)
Unrealized loss on derivatives	(76)
Unfunded pension obligation	(270)	(215)
Foreign currency translation	0	0
Total	1,690	(1,695)
Transactions Net of tax
Unrealized gain on securities available-for-sale	(3,357)	2,439
Unrealized (loss) gain on derivatives	126	0
Net amount recognized in accumulated other comprehensive income (loss)	445	355
Foreign currency translation	(12)	9
Other comprehensive (loss) income	(2,798)	2,803
Balances Net of tax
Unrealized gain on securities available-for-sale	9,445	15,108	12,802	12,669
Unrealized loss on derivatives	(17)		(143)
Unfunded pension obligation	(30,893)	(33,781)	(31,338)	(34,136)
Foreign currency translation	(10)	(14)	2	(23)
Total	$ (21,475)	$ (18,687)	$ (18,677)	$ (21,490)