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ACCUMULATED OTHER COMPREHENSIVE LOSS - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gains on security transactions | $ 0 | $ 0 | $ 19 | $ 0
Income tax expense (benefit) | 176 | 1,802 | 2,443 | 3,349
Pension and other employee benefits | 1,470 | 1,262 | 4,488 | 4,438
Net income | 1,956 | 6,930 | 11,405 | 13,896
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | 13 | 13 | 26 | 40
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 | 0 | 0 | (19) | 0
Income tax expense (benefit) | 0 | 0 | 5 | 0
Net income | 0 | 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) | (165) | (165)
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Pension and other employee benefits | 72 | 72 | 218 | 218
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) | (13) | (13)
Net income | $ 13 | $ 13 | $ 40 | $ 40

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