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OTHER COMPREHENSIVE INCOME : OTHER COMPREHENSIVE INCOME (LOSS)-Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net securities gains (losses) |  |  |  |  |  |  |  |  |  | $ 2 | $ 59 | $ 34
Income tax expense |  |  |  |  |  |  |  |  |  | (11,145) | (20,622) | (19,883)
NET INCOME |  | $ 11,056 | $ 11,313 | $ 15,261 | $ 8,953 | $ 2,616 | $ 8,794 | $ 8,352 | $ 9,369 | 46,583 | 29,131 | 38,413
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  |  |  |  | (1,083) | (698) | (1,195)
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net securities gains (losses) |  |  |  |  |  |  |  |  |  | 2 | 59 | 34
Income tax expense |  |  |  |  |  |  |  |  |  | 0 | (23) | (13)
NET INCOME |  |  |  |  |  |  |  |  |  | 2 | 36 | 21
Retirement Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in funded status of post retirement benefits | [1] |  |  |  |  |  |  |  |  | (1,447) | (1,204) | (1,992)
Income tax expense |  |  |  |  |  |  |  |  |  | 362 | 470 | 776
NET INCOME |  |  |  |  |  |  |  |  |  | $ (1,085) | $ (734) | $ (1,216)
[1] | Included in the computation of net periodic benefit cost which is included in salaries and benefits. (see Footnote 16 for additional details).

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