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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, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Net gain on sales of investment securities | $ 8,506 |  | $ 50 |  | $ 8,506 | $ 50
Income tax (expenses) benefit | (6,184) |  | (5,887) |  | (12,222) | (11,339)
Total reclassification adjustments from AOCI for the period, net of tax | 17,594 | $ 19,438 | 18,714 | $ 18,038 | 37,032 | 36,752
Amortization |  |  |  |  | 1,976 | 0
Amortization of net actuarial loss |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (131) |  | (272) |  | (264) | (518)
Reclassification from AOCI, tax | 35 |  | 87 |  | 71 | 153
Net of tax | (96) |  | (185) |  | (193) | (365)
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) |  | (4) |  | (9) | (9)
Reclassification from AOCI, tax | 1 |  | 1 |  | 2 | 2
Net of tax | (4) |  | (3) |  | (7) | (7)
Settlement |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (4,884) |  |  |  | (4,884) |
Reclassification from AOCI, tax | 1,817 |  |  |  | 1,817 |
Net of tax | (3,067) |  |  |  | (3,067) |
Defined benefit retirement plan and SERPs |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Net of tax | (3,167) |  | (188) |  | (3,267) | (372)
Investment Securities |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Net of tax | (1,448) |  | 37 |  | (1,448) | 37
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 | (4,615) |  | (151) |  | (4,715) | (335)
Amount Reclassified from AOCI | Amortization of net actuarial loss |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (131) |  | (272) |  | (264) | (518)
Amount Reclassified from AOCI | 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) |  | (4) |  | (9) | (9)
Amount Reclassified from AOCI | Amortization of prior service cost |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | 0 |  | 0 |  | 0 | 0
Amount Reclassified from AOCI | Settlement |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (4,884) |  | 0 |  | (4,884) | 0
Amount Reclassified from AOCI | Defined benefit retirement plan and SERPs |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of defined benefit plan items, before tax | (5,020) |  | (276) |  | (5,157) | (527)
Reclassification from AOCI, tax | 1,853 |  | 88 |  | 1,890 | 155
Net of tax | (3,167) |  | (188) |  | (3,267) | (372)
Amount Reclassified from AOCI | Investment Securities |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Net gain on sales of investment securities |  |  |  |  | 0 | 50
Income tax (expenses) benefit |  |  |  |  | 0 | (13)
Total reclassification adjustments from AOCI for the period, net of tax |  |  |  |  | 0 | 37
Amount Reclassified from AOCI | Accumulated Net Unrealized Loss on Held To Maturity Securities |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization | (1,976) |  | 0 |  | (1,976) | 0
Less: Amortization of unrealized losses on investment securities transferred to held-to-maturity | 528 |  | 0 |  | 528 | 0
Net of tax | $ (1,448) |  | $ 0 |  | $ (1,448) | $ 0

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