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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 $ 12,168 $ 4,774 $ (21,587)
Tax effect (3,038) (1,162) 5,243
Amortization of actuarial losses (gains) included in net periodic pension cost and (increase) decrease in unrecognized actuarial (gain) loss, net 9,130 3,612 (16,344)
Amortization of prior service cost included in net periodic pension cost, gross 641 641 678
Tax effect (160) (156) (165)
Amortization of prior service cost included in net periodic pension cost, net 481 485 513
Other comprehensive income (loss) related to pension and other post-retirement obligations, net of taxes 9,611 4,097 (15,831)
Net unrealized (losses) gains on investment securities:      
Net unrealized holding (losses) gains on investment securities, gross (1,570) 113,464 (818,890)
Tax effect 401 (27,629) 198,909
Net unrealized holding (losses) gains on investment securities, net (1,169) 85,835 (619,981)
Reclassification adjustment for net losses included in net income, gross 487 52,329 0
Tax effect (122) (12,714) 0
Reclassification adjustment for net losses included in net income, net 365 39,615 0
Other comprehensive (loss) income related to unrealized (losses) gains on investment securities, net of taxes (804) 125,450 (619,981)
Other comprehensive income (loss), net of taxes 8,807 129,547 (635,812)
Net income 182,481 131,924 188,081
Comprehensive income (loss) 191,288 261,471 (447,731)
Accumulated Other Comprehensive Loss by Component:      
Unrealized loss for pension and other post-retirement obligations (23,309) (36,118) (41,533)
Tax effect 5,716 8,914 10,232
Net unrealized loss for pension and other post-retirement obligations (17,593) (27,204) (31,301)
Unrealized loss on investment securities (700,073) (698,990) (864,783)
Tax effect 169,581 169,302 209,645
Net unrealized loss on investment securities (530,492) (529,688) (655,138)
Accumulated other comprehensive loss $ (548,085) $ (556,892) $ (686,439)