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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)      
Unrealized holding gains on available for sale investment securities $ 22,740 $ 24,011 $ 2,985
Unrealized holding losses on derivatives (10,993) (10,559) (7,324)
Pension liability adjustments (12,577) (11,288) (10,226)
Accumulated other comprehensive income, net of tax (830) 2,164 (14,565)
Available for sale securities:      
Change in unrealized gain/loss during the period (2,653) 22,190 (5,357)
Reclassification adjustment for gain/loss included in net income 1,382 (1,164) 2,391
Change in accumulated gain/loss on effective cash flow hedging derivatives (434) (3,235) (7,377)
Change in the net actuarial gain/loss on defined benefit post-retirement benefit plans (1,289) (1,062) (711)
Other comprehensive income (loss), net of tax $ (2,994) $ 16,729 $ (11,054)