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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Amounts reclassified out of each component of accumulated other comprehensive income    
Income tax benefit (expense) $ (3,692) $ (6,810)
Net income 14,277 13,079
Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Net income (256) (263)
Investment Securities    
Amounts reclassified out of each component of accumulated other comprehensive income    
Reclassification from AOCI, net of tax 0 0
Investment Securities | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Investment securities gains (losses) 0 0
Income tax benefit (expense) 0 0
Net income 0 0
Defined Benefit Plans    
Amounts reclassified out of each component of accumulated other comprehensive income    
Reclassification from AOCI, net of tax (256) (263)
Defined Benefit Plans | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (351) (429)
Amortization of defined benefit plan items, tax 95 166
Reclassification from AOCI, net of tax (256) (263)
Net actuarial loss    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (341) (421)
Amortization of defined benefit plan items, tax 93 164
Reclassification from AOCI, net of tax (248) (257)
Net actuarial loss | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (341) (421)
Net transition obligation    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (5) (4)
Amortization of defined benefit plan items, tax 1 1
Reclassification from AOCI, net of tax (4) (3)
Net transition obligation | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (5) (4)
Prior service cost    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (5) (4)
Amortization of defined benefit plan items, tax 1 1
Reclassification from AOCI, net of tax (4) (3)
Prior service cost | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (5) (4)
Settlement    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax 0  
Amortization of defined benefit plan items, tax 0  
Reclassification from AOCI, net of tax 0  
Settlement | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax $ 0 $ 0