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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension and other post retirement obligations: |  |  |
Amortization of actuarial losses (gains) included in net periodic pension cost and (increase) decrease in unrecognized actuarial (gain) loss, gross | $ 4,774 | $ (21,587) | $ 17,443
Tax effect | (1,162) | 5,243 | (4,192)
Amortization of actuarial losses (gains) included in net periodic pension cost and (increase) decrease in unrecognized actuarial (gain) loss, net | 3,612 | (16,344) | 13,251
Amortization of prior service cost included in net periodic pension cost, gross | 641 | 678 | 200
Tax effect | (156) | (165) | (48)
Amortization of prior service cost included in net periodic pension cost, net | 485 | 513 | 152
Other comprehensive income (loss) related to pension and other post retirement obligations, net of taxes | 4,097 | (15,831) | 13,403
Net unrealized gains (losses) on investment securities: |  |  |
Net unrealized holding gains (losses) on investment securities, gross | 113,464 | (818,890) | (166,007)
Tax effect | (27,629) | 198,909 | 39,900
Net unrealized holding gains (losses) on investment securities, net | 85,835 | (619,981) | (126,107)
Reclassification adjustment for net losses included in net income, gross | 52,329 | 0 | 0
Tax effect | (12,714) | 0 | 0
Reclassification adjustment for net losses included in net income, net | 39,615 | 0 | 0
Other comprehensive income (loss) related to unrealized gains (losses) on investment securities, net of taxes | 125,450 | (619,981) | (126,107)
Other comprehensive income (loss), net of tax | 129,547 | (635,812) | (112,704)
Net income | 131,924 | 188,081 | 189,694
Comprehensive income (loss) | 261,471 | (447,731) | 76,990
Accumulated Other Comprehensive Loss By Component: |  |  |
Unrealized loss for pension and other postretirement obligations | (36,118) | (41,533) | (20,624)
Tax effect | 8,914 | 10,232 | 5,154
Net unrealized loss for pension and other postretirement obligations | (27,204) | (31,301) | (15,470)
Unrealized loss on investment securities | (698,990) | (864,783) | (45,893)
Tax effect | 169,302 | 209,645 | 10,736
Net unrealized loss on investment securities | (529,688) | (655,138) | (35,157)
Accumulated other comprehensive loss | $ (556,892) | $ (686,439) | $ (50,627)

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