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ACCUMULATED OTHER COMPREHENSIVE LOSS - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gains on security transactions | $ 19 | $ 0 | $ 19 | $ 0
Income tax expense (benefit) | 1,233 | 486 | 2,267 | 1,547
Pension and other employee benefits | 1,473 | 1,518 | 3,018 | 3,176
Net income | 4,981 | 2,527 | 9,449 | 6,966
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | 0 | 14 | 13 | 27
Unrealized Gains and Losses on Securities Available for Sale | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gains on security transactions | (19) | 0 | (19) | 0
Income tax expense (benefit) | 5 | 0 | 5 | 0
Net income | (14) | 0 | (14) | 0
Prior service costs | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension and other employee benefits | (55) | (55) | (110) | (110)
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension and other employee benefits | 73 | 73 | 146 | 146
Defined Benefit and Other Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | (4) | (4) | (9) | (9)
Net income | $ (14) | $ (14) | $ 27 | $ 27

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