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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net unrealized gain/loss on investment securities, Before Tax        
Net unrealized gain/loss arising during the period $ 5,476 $ 9,444 $ (38,924) $ 7,660
Less: Reclassification adjustment for gains realized in net income   (1,382)   (1,382)
Net unrealized gain (loss) on investment securities 5,476 8,062 (38,924) 6,278
Net unrealized gain/loss on derivatives, Before Tax        
Reclassification adjustment for gain/loss realized in net income   (3) 394 (934)
Net unrealized gain (loss) on derivatives   (3) 394 (934)
Defined benefit plans, Before Tax        
Amortization of accumulated benefit plan losses 617 580 1,851 1,740
Amortization of unrecognized transition obligations 4 4 12 12
Amortization of prior service cost 5 4 15 13
Defined benefit plans, net 626 588 1,878 1,765
Other comprehensive income (loss) 6,102 8,647 (36,652) 7,109
Net unrealized gain/loss on investment securities, Tax Effect        
Net unrealized gain/loss arising during the period 2,809   (13,668)  
Net unrealized gain (loss) on investment securities 2,809   (13,668)  
Net unrealized gain/loss on derivatives, Tax Effect        
Reclassification adjustment for gain/loss realized in net income     (10,599)  
Net unrealized gain (loss) on derivatives     (10,599)  
Defined benefit plans, Tax Effect        
Amortization of accumulated benefit plan losses 248   496  
Amortization of unrecognized transition obligations 1   3  
Amortization of prior service cost 2   4  
Defined benefit plans, net 251   503  
Other comprehensive income (loss) 3,060   (23,764)  
Net unrealized gain/loss on investment securities, Net of Tax        
Net unrealized gain/loss arising during the period 2,667 9,444 (25,256) 7,660
Less: Reclassification adjustment for gain/loss realized in net income   (1,382)   (1,382)
Net unrealized gain (loss) on investment securities 2,667 8,062 (25,256) 6,278
Net unrealized gain/loss on derivatives, Net of Tax        
Reclassification adjustment for gain/loss realized in net income   (3) 10,993 (934)
Net unrealized gain (loss) on derivatives   (3) 10,993 (934)
Defined benefit plans, Net of Tax        
Amortization of accumulated benefit plan losses 369 580 1,355 1,740
Amortization of unrecognized transition obligations 3 4 9 12
Amortization of prior service cost 3 4 11 13
Defined benefit plans, net 375 588 1,375 1,765
Other comprehensive income (loss), net of tax $ 3,042 $ 8,647 $ (12,888) $ 7,109