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OTHER COMPREHENSIVE INCOME : OTHER COMPREHENSIVE INCOME (LOSS)-Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net securities gains (losses) |  |  |  |  |  |  |  |  |  | $ 233 | $ 44 | $ 2
Income tax expense |  |  |  |  |  |  |  |  |  | (11,692) | (12,127) | (11,145)
NET INCOME |  | $ 15,739 | $ 14,000 | $ 11,924 | $ 12,181 | $ 14,364 | $ 12,257 | $ 12,569 | $ 9,682 | 53,844 | 48,872 | 46,583
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  |  |  |  | (1,300) | (1,135) | (1,083)
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) |  |  |  |  |  |  |  |  |  | 233 | 44 | 2
Income tax expense |  |  |  |  |  |  |  |  |  | (58) | (11) | 0
NET INCOME |  |  |  |  |  |  |  |  |  | 175 | 33 | 2
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] |  |  |  |  |  |  |  |  | (1,967) | (1,558) | (1,447)
Income tax expense |  |  |  |  |  |  |  |  |  | 492 | 390 | 362
NET INCOME |  |  |  |  |  |  |  |  |  | $ (1,475) | $ (1,168) | $ (1,085)
[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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