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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Total reclassification adjustments from AOCI for the period, net of tax | $ 18,714 | $ 18,038 | $ 9,917 | $ 8,326 | $ 36,752 | $ 18,243
Amount Reclassified from AOCI |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Total reclassification adjustments from AOCI for the period, net of tax | (151) |  | (204) |  | (335) | (407)
Investment Securities |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Reclassification from AOCI, net of tax | 37 |  | 0 |  | 37 | 0
Defined Benefit Plans |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Reclassification from AOCI, net of tax | (188) |  | (204) |  | (372) | (407)
Defined Benefit Plans | Amount Reclassified from AOCI |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (276) |  | (276) |  | (527) | (553)
Amortization of defined benefit plan items, tax | 88 |  | 72 |  | 155 | 146
Reclassification from AOCI, net of tax | (188) |  | (204) |  | (372) | (407)
Amortization of net actuarial loss |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (272) |  | (269) |  | (518) | (537)
Amortization of defined benefit plan items, tax | 87 |  | 70 |  | 153 | 142
Reclassification from AOCI, net of tax | (185) |  | (199) |  | (365) | (395)
Amortization of net actuarial loss | Amount Reclassified from AOCI |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (272) |  | (269) |  | (518) | (537)
Amortization of net transition obligation |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (4) |  | (4) |  | (9) | (9)
Amortization of defined benefit plan items, tax | 1 |  | 1 |  | 2 | 2
Reclassification from AOCI, net of tax | (3) |  | (3) |  | (7) | (7)
Amortization of net transition obligation | Amount Reclassified from AOCI |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (4) |  | (4) |  | (9) | (9)
Amortization of prior service cost |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax |  |  | (3) |  |  | (7)
Amortization of defined benefit plan items, tax |  |  | 1 |  |  | 2
Reclassification from AOCI, net of tax |  |  | (2) |  |  | (5)
Amortization of prior service cost | Amount Reclassified from AOCI |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | $ 0 |  | $ (3) |  | $ 0 | $ (7)

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