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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, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Income tax benefit (expense) | $ (2,967) |  | $ (4,427) |  | $ (5,788) | $ (9,545)
Net income | 9,917 | $ 8,326 | 13,534 | $ 16,037 | 18,243 | 29,571
Amount Reclassified from AOCI |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Net income | (204) |  | (248) |  | (407) | (490)
Investment Securities |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Reclassification from AOCI, net of tax | 0 |  | 0 |  | 0 | 0
Defined Benefit Plans |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Reclassification from AOCI, net of tax | (204) |  | (248) |  | (407) | (490)
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) |  | (272) |  | (553) | (545)
Amortization of defined benefit plan items, tax | 72 |  | 24 |  | 146 | 55
Reclassification from AOCI, net of tax | (204) |  | (248) |  | (407) | (490)
Amortization of net actuarial loss |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (269) |  | (264) |  | (537) | (527)
Amortization of defined benefit plan items, tax | 70 |  | 22 |  | 142 | 51
Reclassification from AOCI, net of tax | (199) |  | (242) |  | (395) | (476)
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 | (269) |  | (264) |  | (537) | (527)
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) |  | (4) |  | (7) | (9)
Amortization of defined benefit plan items, tax | 1 |  | 1 |  | 2 | 2
Reclassification from AOCI, net of tax | (2) |  | (3) |  | (5) | (7)
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 | $ (3) |  | $ (4) |  | $ (7) | $ (9)

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