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OTHER COMPREHENSIVE INCOME : OTHER COMPREHENSIVE INCOME (LOSS)-Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net securities gains (losses) |  |  |  |  |  |  |  |  |  | $ 44 | $ 2 | $ 59
Income tax expense |  |  |  |  |  |  |  |  |  | (12,127) | (11,145) | (20,622)
NET INCOME |  | $ 14,364 | $ 12,257 | $ 12,569 | $ 9,682 | $ 11,056 | $ 11,313 | $ 15,261 | $ 8,953 | 48,872 | 46,583 | 29,131
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  |  |  |  | (1,135) | (1,083) | (698)
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) |  |  |  |  |  |  |  |  |  | 44 | 2 | 59
Income tax expense |  |  |  |  |  |  |  |  |  | (11) | 0 | (23)
NET INCOME |  |  |  |  |  |  |  |  |  | 33 | 2 | 36
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] |  |  |  |  |  |  |  |  | (1,558) | (1,447) | (1,204)
Income tax expense |  |  |  |  |  |  |  |  |  | 390 | 362 | 470
NET INCOME |  |  |  |  |  |  |  |  |  | $ (1,168) | $ (1,085) | $ (734)
[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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