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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Before Tax        
Net actuarial losses arising during the period, before tax       $ (1,042)
Other comprehensive income (loss), before tax $ (7,999) $ (154) $ (32,917) 7,775
Tax Effect        
Net actuarial losses arising during the period, tax       (415)
Other comprehensive income, tax (2,144) (146) (8,828) 3,038
Net of Tax        
Net actuarial losses arising during the period, net of tax       (627)
Total other comprehensive income (loss), net of tax (5,855) (8) (24,089) 4,737
Net unrealized gains on investment securities        
Before Tax        
Other comprehensive income (loss) before reclassification, before tax (8,297) (487) (33,809) 6,042
Reclassification from AOCI, before tax 0 0 0 1,640
Other comprehensive income (loss), before tax (8,297) (487) (33,809) 7,682
Tax Effect        
Other comprehensive income (loss) before reclassifications, tax (2,225) (194) (9,097) 2,403
Reclassification from AOCI, tax 0 0 0 653
Other comprehensive income, tax (2,225) (194) (9,097) 3,056
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax (6,072) (293) (24,712) 3,639
Reclassification from AOCI, net of tax 0 0 0 987
Total other comprehensive income (loss), net of tax (6,072) (293) (24,712) 4,626
Amortization of net actuarial loss        
Before Tax        
Reclassification from AOCI, before tax 289 324 865 971
Tax Effect        
Reclassification from AOCI, tax 78 44 262 331
Net of Tax        
Reclassification from AOCI, net of tax 211 280 603 640
Amortization of net transition obligation        
Before Tax        
Reclassification from AOCI, before tax 5 4 14 13
Tax Effect        
Reclassification from AOCI, tax 2 2 4 5
Net of Tax        
Reclassification from AOCI, net of tax 3 2 10 8
Amortization of prior service cost        
Before Tax        
Reclassification from AOCI, before tax 4 5 13 13
Tax Effect        
Reclassification from AOCI, tax 1 2 3 5
Net of Tax        
Reclassification from AOCI, net of tax 3 3 10 8
Settlement        
Before Tax        
Reclassification from AOCI, before tax   0   138
Tax Effect        
Reclassification from AOCI, tax   0   56
Net of Tax        
Reclassification from AOCI, net of tax   0   82
Defined benefit plans, net        
Before Tax        
Other comprehensive income (loss), before tax (298) (333) (892) (93)
Tax Effect        
Other comprehensive income, tax (81) (48) (269) 18
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax 0 0 0 (627)
Reclassification from AOCI, net of tax 217 285 623 738
Total other comprehensive income (loss), net of tax $ 217 $ 285 $ 623 $ 111