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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Before Tax    
Net actuarial losses arising during the period, before tax   $ (1,042)
Other comprehensive income (loss), before tax $ (20,104) 2,914
Tax Effect    
Net actuarial losses arising during the period, tax   (415)
Other comprehensive income, tax (5,389) 1,154
Net of Tax    
Net actuarial losses arising during the period, net of tax   (627)
Total other comprehensive income (loss), net of tax (14,715) 1,760
Net unrealized gains on investment securities    
Before Tax    
Other comprehensive income (loss) before reclassification, before tax (20,455) 3,527
Reclassification from AOCI, before tax 0 0
Other comprehensive income (loss), before tax (20,455) 3,527
Tax Effect    
Other comprehensive income (loss) before reclassifications, tax (5,484) 1,403
Reclassification from AOCI, tax 0 0
Other comprehensive income, tax (5,484) 1,403
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax (14,971) 2,124
Reclassification from AOCI, net of tax 0 0
Total other comprehensive income (loss), net of tax (14,971) 2,124
Amortization of net actuarial loss    
Before Tax    
Reclassification from AOCI, before tax 341 421
Tax Effect    
Reclassification from AOCI, tax 93 164
Net of Tax    
Reclassification from AOCI, net of tax (248) (257)
Amortization of net transition obligation    
Before Tax    
Reclassification from AOCI, before tax 5 4
Tax Effect    
Reclassification from AOCI, tax 1 1
Net of Tax    
Reclassification from AOCI, net of tax (4) (3)
Amortization of prior service cost    
Before Tax    
Reclassification from AOCI, before tax 5 4
Tax Effect    
Reclassification from AOCI, tax 1 1
Net of Tax    
Reclassification from AOCI, net of tax (4) (3)
Settlement    
Before Tax    
Reclassification from AOCI, before tax 0  
Tax Effect    
Reclassification from AOCI, tax 0  
Net of Tax    
Reclassification from AOCI, net of tax 0  
Defined benefit plans, net    
Before Tax    
Other comprehensive income (loss), before tax (351) 613
Tax Effect    
Other comprehensive income, tax (95) 249
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax 0 (627)
Reclassification from AOCI, net of tax (256) (263)
Total other comprehensive income (loss), net of tax $ 256 $ (364)