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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Investment securities gains (losses) | $ 100 |  |  | $ (352) |  |  | $ 150 | $ (352)
Income tax (expenses) benefit | (6,814) |  |  | (2,200) |  |  | (18,153) | (7,988)
Total reclassification adjustments from AOCI for the period, net of tax | 20,815 | $ 18,714 | $ 18,038 | 6,859 | $ 9,917 | $ 8,326 | 57,567 | 25,102
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 | (120) |  |  | (505) |  |  | (455) | (912)
Investment Securities |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Reclassification from AOCI, net of tax | 73 |  |  | (258) |  |  | 110 | (258)
Investment Securities | Amount Reclassified from AOCI |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Investment securities gains (losses) | 100 |  |  | (352) |  |  | 150 | (352)
Income tax (expenses) benefit | (27) |  |  | 94 |  |  | (40) | 94
Total reclassification adjustments from AOCI for the period, net of tax | 73 |  |  | (258) |  |  | 110 | (258)
Defined Benefit Plans |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Reclassification from AOCI, net of tax | (193) |  |  | (247) |  |  | (565) | (654)
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 | (264) |  |  | (338) |  |  | (791) | (891)
Amortization of defined benefit plan items, tax | 71 |  |  | 91 |  |  | 226 | 237
Reclassification from AOCI, net of tax | (193) |  |  | (247) |  |  | (565) | (654)
Amortization of net actuarial loss |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (259) |  |  | (330) |  |  | (777) | (867)
Amortization of defined benefit plan items, tax | 70 |  |  | 89 |  |  | 222 | 230
Reclassification from AOCI, net of tax | (189) |  |  | (241) |  |  | (555) | (637)
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 | (259) |  |  | (330) |  |  | (777) | (867)
Amortization of net transition obligation |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (5) |  |  | (5) |  |  | (14) | (14)
Amortization of defined benefit plan items, tax | 1 |  |  | 1 |  |  | 4 | 4
Reclassification from AOCI, net of tax | (4) |  |  | (4) |  |  | (10) | (10)
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 | (5) |  |  | (5) |  |  | (14) | (14)
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) |  |  |  | (10)
Amortization of defined benefit plan items, tax |  |  |  | 1 |  |  |  | 3
Reclassification from AOCI, net of tax |  |  |  | (2) |  |  |  | (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 | $ 0 |  |  | $ (3) |  |  | $ 0 | $ (10)

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