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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Before Tax        
Net actuarial losses arising during the period, before tax       $ (1,042)
Other comprehensive income (loss), before tax $ (4,814) $ 5,113 $ (24,918) 7,928
Tax Effect        
Net actuarial losses arising during the period, tax       (415)
Other comprehensive income, tax (1,295) 2,128 (6,684) 3,183
Net of Tax        
Net actuarial losses arising during the period, net of tax       (627)
Total other comprehensive income (loss), net of tax (3,519) 2,985 (18,234) 4,745
Net unrealized gains on investment securities        
Before Tax        
Other comprehensive income (loss) before reclassification, before tax (5,057) 3,001 (25,512) 6,528
Reclassification from AOCI, before tax 0 1,640 0 1,640
Other comprehensive income (loss), before tax (5,057) 4,641 (25,512) 8,168
Tax Effect        
Other comprehensive income (loss) before reclassifications, tax (1,388) 1,193 (6,872) 2,596
Reclassification from AOCI, tax 0 653 0 653
Other comprehensive income, tax (1,388) 1,846 (6,872) 3,249
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax (3,669) 1,808 (18,640) 3,932
Reclassification from AOCI, net of tax 0 987 0 987
Total other comprehensive income (loss), net of tax (3,669) 2,795 (18,640) 4,919
Amortization of net actuarial loss        
Before Tax        
Reclassification from AOCI, before tax 235 325 576 647
Tax Effect        
Reclassification from AOCI, tax 91 222 184 287
Net of Tax        
Reclassification from AOCI, net of tax 144 103 392 360
Amortization of net transition obligation        
Before Tax        
Reclassification from AOCI, before tax 4 5 9 9
Tax Effect        
Reclassification from AOCI, tax 1 2 2 3
Net of Tax        
Reclassification from AOCI, net of tax 3 3 7 6
Amortization of prior service cost        
Before Tax        
Reclassification from AOCI, before tax 4 4 9 8
Tax Effect        
Reclassification from AOCI, tax 1 2 2 3
Net of Tax        
Reclassification from AOCI, net of tax 3 2 7 5
Settlement        
Before Tax        
Reclassification from AOCI, before tax   138   138
Tax Effect        
Reclassification from AOCI, tax   56   56
Net of Tax        
Reclassification from AOCI, net of tax   82   82
Defined benefit plans, net        
Before Tax        
Other comprehensive income (loss), before tax (243) (472) (594) 240
Tax Effect        
Other comprehensive income, tax (93) (282) (188) 66
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax 0 0 0 (627)
Reclassification from AOCI, net of tax 150 190 406 453
Total other comprehensive income (loss), net of tax $ 150 $ 190 $ 406 $ (174)