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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Realized gains on securities available for sale $ 75 $ (11) $ 983 $ 291
Pension and other employee benefits 1,573 1,562 4,894 4,848
Tax effect 1,209 1,211 3,130 3,651
Net of tax 2,745 2,451 7,073 7,304
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net of tax 186 230 86 497
Unrealized Gains and Losses on Securities Available for Sale [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Realized gains on securities available for sale (75) 11 (983) (291)
Tax effect 28 (4) 371 118
Net of tax (47) 7 (612) (173)
Defined Benefit and Other Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Tax effect (141) (139) (423) (416)
Net of tax 233 223 698 670
Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Pension and other employee benefits (22) (22) (67) (65)
Actuarial Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Pension and other employee benefits $ 396 $ 384 $ 1,188 $ 1,151