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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gains | $ 0 | $ 314 | $ 797 | $ 363
Income tax expense | 5,469 | 5,377 | 16,204 | 13,468
Net income | 24,119 | 22,776 | 71,450 | 59,745
Other expense | 2,694 | 2,175 | 6,842 | 6,255
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | (46) | 200 | 494 | 145
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available- for-Sales Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gains | 0 | 314 | 797 | 363
Income tax expense | 0 | (66) | (167) | (76)
Net income | 0 | 248 | 630 | 287
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Items |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense | 15 | 15 | 45 | 47
Net income | (46) | (48) | (136) | (142)
Other expense | $ (61) | $ (63) | $ (181) | $ (189)

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