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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Before Tax        
Net actuarial losses arising during the period, before tax     $ (1,042) $ 0
Other comprehensive income (loss), before tax $ (154) $ (3,016) 7,775 27,155
Tax Effect        
Net actuarial losses arising during the period, tax     (415) 0
Other comprehensive income, tax (146) (1,223) 3,038 10,730
Net of Tax        
Net actuarial losses arising during the period, net of tax     627 0
Total other comprehensive income (loss), net of tax (8) (1,793) 4,737 16,425
Net unrealized gains on investment securities        
Before Tax        
Other comprehensive income (loss) before reclassification, before tax (487) (3,390) 6,042 26,030
Reclassification from AOCI, before tax 0 0 1,640 0
Other comprehensive income (loss), before tax (487) (3,390) 7,682 26,030
Tax Effect        
Other comprehensive income (loss) before reclassifications, tax (194) (1,348) 2,403 10,353
Reclassification from AOCI, tax 0 0 653 0
Other comprehensive income, tax (194) (1,348) 3,056 10,353
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax (293) (2,042) 3,639 15,677
Reclassification from AOCI, net of tax 0 0 (987) 0
Total other comprehensive income (loss), net of tax (293) (2,042) 4,626 15,677
Amortization of net actuarial loss        
Before Tax        
Reclassification from AOCI, before tax 324 366 971 1,099
Tax Effect        
Reclassification from AOCI, tax 44 123 331 371
Net of Tax        
Reclassification from AOCI, net of tax (280) (243) (640) (728)
Amortization of net transition obligation        
Before Tax        
Reclassification from AOCI, before tax 4 4 13 12
Tax Effect        
Reclassification from AOCI, tax 2 1 5 3
Net of Tax        
Reclassification from AOCI, net of tax (2) (3) (8) (9)
Amortization of prior service cost        
Before Tax        
Reclassification from AOCI, before tax 5 4 13 14
Tax Effect        
Reclassification from AOCI, tax 2 1 5 3
Net of Tax        
Reclassification from AOCI, net of tax (3) (3) (8) (11)
Settlement        
Before Tax        
Reclassification from AOCI, before tax     138  
Tax Effect        
Reclassification from AOCI, tax     56  
Net of Tax        
Reclassification from AOCI, net of tax     (82)  
Defined benefit plans, net        
Before Tax        
Other comprehensive income (loss), before tax (333) (374) (93) (1,125)
Tax Effect        
Other comprehensive income, tax (48) (125) 18 (377)
Net of Tax        
Other comprehensive income (loss), before reclassifications, net of tax 0 0 (627) 0
Reclassification from AOCI, net of tax (285) (249) (738) (748)
Total other comprehensive income (loss), net of tax $ 285 $ 249 $ 111 $ 748