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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net unrealized gain/loss on investment securities, Before Tax        
Net unrealized gain/loss arising during the period, Before Tax $ (39,577) $ 1,696 $ (44,400) $ (1,784)
Change in net unrealized gain/loss on investment securities, Before Tax (39,577) 1,696 (44,400) (1,784)
Net unrealized gain/loss on derivatives, Before Tax        
Reclassification adjustment for gain/loss realized in net income, Before Tax   (359) 394 (931)
Change in net unrealized gain/loss on derivatives, Before Tax   (359) 394 (931)
Defined benefit plans, Before Tax        
Amortization of accumulated benefit plan losses, Before Tax 618 580 1,234 1,160
Amortization of unrecognized transition obligations, Before Tax 4 4 8 8
Amortization of prior service cost, Before Tax 5 4 10 9
Change in defined benefit plans, Before Tax 627 588 1,252 1,177
Change in accumulated other comprehensive income, Before tax (38,950) 1,925 (42,754) (1,538)
Net unrealized gain/loss on investment securities, Tax        
Net unrealized loss arising during the period, Tax (16,477)   (16,477)  
Change in net unrealized gain/loss on investment securities, Tax (16,477)   (16,477)  
Net unrealized gain/loss on derivatives, Tax        
Reclassification adjustment for gain/loss realized in net income, Tax     (10,599)  
Change in net unrealized gain/loss on derivatives, Tax     (10,599)  
Defined benefit plans, Tax        
Amortization of accumulated benefit plan losses, Tax 248   248  
Amortization of unrecognized transition obligations, Tax 2   2  
Amortization of prior service cost, Tax 2   2  
Change in defined benefit plans, Tax 252   252  
Change in accumulated other comprehensive income, Tax (16,225)   (26,824)  
Net unrealized gain/loss on investment securities, Net of Tax        
Net unrealized gain/loss arising during the period, Net of Tax (23,100) 1,696 (27,923) (1,784)
Change in net unrealized gain/loss on investment securities, Net of Tax (23,100) 1,696 (27,923) (1,784)
Net unrealized gain/loss on derivatives, Net of Tax        
Reclassification adjustment for gain/loss realized in net income, Net of Tax   (359) 10,993 (931)
Change in net unrealized gain/loss on derivatives, Net of Tax   (359) 10,993 (931)
Defined benefit plans, Net of Tax        
Amortization of accumulated benefit plan losses, Net of Tax 370 580 986 1,160
Amortization of unrecognized transition obligations, Net of Tax 2 4 6 8
Amortization of prior service cost, Net of Tax 3 4 8 9
Change in defined benefit plans, Net of Tax 375 588 1,000 1,177
Change in accumulated other comprehensive income, Net of Tax $ (22,725) $ 1,925 $ (15,930) $ (1,538)