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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of accumulated other comprehensive (loss) income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income Loss Defined Benefit Pension and Other Postretirement Plans Net Of Tax [Roll Forward]    
Balance $ (1,771) $ (1,666)
Change during the quarter:    
Before-tax amount      
Tax (expense) benefit      
Reclassification adjustment, net of taxes    
Amortization of net loss 11 [1] 10 [1]
Net realized gain    [2]    [2]
Total activity for the quarter 11 10
Balance (1,760) (1,656)
Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Roll Forward]    
Balance 199 208
Change during the quarter:    
Before-tax amount (3) 37
Tax (expense) benefit 1 (13)
Reclassification adjustment, net of taxes    
Amortization of net loss    [1]    [1]
Net realized gain 15 [2] 25 [2]
Total activity for the quarter 13 49
Balance 212 257
Increase Decrease In Accumulated Other Comprehensive Income Loss Net Of Tax Two [Roll Forward]    
Balance (1,572) (1,458)
Change during the quarter:    
Before-tax amount (3) 37
Tax (expense) benefit 1 (13)
Reclassification adjustment, net of taxes    
Amortization of net loss 11 [1] 10 [1]
Net realized gain 15 [2] 25 [2]
Total activity for the quarter 24 59
Balance $ (1,548) $ (1,399)
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.