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OTHER COMPREHENSIVE INCOME (LOSS): (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Unrealized gains (losses) on securities available-for-sale Balance $ 12,740    
Unrealized gains (losses) on securities available-for-sale Current Period Change 691 8,857 449
Unrealized gains (losses) on securities available-for-sale Balance 13,431 12,740  
Unrealized loss on retirement plans Balance (23,234)    
Total recognized in other comprehensive income (loss) (2,331) 9,982 1,914
Unrealized loss on retirement plans Balance (20,903) (23,234)  
TOTAL Balance (10,494)    
TOTAL Current Period Change 3,022    
TOTAL Balance $ (7,472) $ (10,494)