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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities gains (losses) $ 0 $ (1,640) $ 0 $ (1,640)
Income tax benefit (expense) (3,822) (7,421) (7,514) (14,231)
Net income 14,224 12,025 28,501 25,104
Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Net income (150) (1,177) (406) (1,440)
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 (987) 0 (987)
Investment Securities | Amount Reclassified from AOCI        
Amounts reclassified out of each component of accumulated other comprehensive income        
Investment securities gains (losses) 0 (1,640) 0 (1,640)
Income tax benefit (expense) 0 653 0 653
Net income 0 (987) 0 (987)
Defined Benefit Plans        
Amounts reclassified out of each component of accumulated other comprehensive income        
Reclassification from AOCI, net of tax (150) (190) (406) (453)
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 (243) (472) (594) (802)
Amortization of defined benefit plan items, tax 93 282 188 349
Reclassification from AOCI, net of tax (150) (190) (406) (453)
Net actuarial loss        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (235) (325) (576) (647)
Amortization of defined benefit plan items, tax 91 222 184 287
Reclassification from AOCI, net of tax (144) (103) (392) (360)
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 (235) (325) (576) (647)
Net transition obligation        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (5) (9) (9)
Amortization of defined benefit plan items, tax 1 2 2 3
Reclassification from AOCI, net of tax (3) (3) (7) (6)
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 (4) (5) (9) (9)
Prior service cost        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax (4) (4) (9) (8)
Amortization of defined benefit plan items, tax 1 2 2 3
Reclassification from AOCI, net of tax (3) (2) (7) (5)
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) (4) (9) (8)
Settlement        
Amounts reclassified out of each component of accumulated other comprehensive income        
Amortization of defined benefit plan items, before tax   (138)   (138)
Amortization of defined benefit plan items, tax   56   56
Reclassification from AOCI, net of tax   $ (82)   (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 $ (138)