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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities gains (losses) $ 0 $ 0 $ 0 $ (1,640)
Income tax benefit (expense) (4,872) (6,367) (12,386) (20,598)
Net income 15,193 11,812 43,694 36,916
Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net income (217) (285) (623) (1,725)
Amortization of defined benefit plan items, before tax     0 (138)
Investment Securities        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax 0 0 0 (987)
Investment Securities | Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities gains (losses) 0 0 0 (1,640)
Income tax benefit (expense) 0 0 0 653
Net income 0 0 0 (987)
Defined Benefit Plans        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax (217) (285) (623) (738)
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 (298) (333) (892) (1,135)
Amortization of defined benefit plan items, tax 81 48 269 397
Reclassification from AOCI, net of tax (217) (285) (623) (738)
Net actuarial loss        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (289) (324) (865) (971)
Amortization of defined benefit plan items, tax 78 44 262 331
Reclassification from AOCI, net of tax (211) (280) (603) (640)
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 (289) (324) (865) (971)
Net transition obligation        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (5) (4) (14) (13)
Amortization of defined benefit plan items, tax 2 2 4 5
Reclassification from AOCI, net of tax (3) (2) (10) (8)
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) (14) (13)
Prior service cost        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (5) (13) (13)
Amortization of defined benefit plan items, tax 1 2 3 5
Reclassification from AOCI, net of tax (3) (3) (10) (8)
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 (4) (5) $ (13) (13)
Settlement        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax   0   (138)
Amortization of defined benefit plan items, tax   0   56
Reclassification from AOCI, net of tax   0   $ (82)
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