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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Pension and other post retirement obligations:          
Amortization of actuarial losses (gains) included in net periodic pension cost, gross $ 289 $ (549) $ 579 $ (1,098)  
Tax effect (70) 133 (141) 267  
Amortization of actuarial losses (gains) included in net periodic pension cost, net 219 (416) 438 (831)  
Amortization of prior service cost included in net periodic pension cost, gross 160 160 320 320  
Tax effect (39) (39) (78) (78)  
Amortization of prior service cost included in net periodic pension cost, net 121 121 242 242  
Other comprehensive income (loss) related to pension and other post-retirement obligations, net of taxes 340 (295) 680 (589)  
Net unrealized (losses) gains on investment securities:          
Net unrealized holding (losses) gains on investment securities, gross (3,298) (44,039) (39,364) 47,221  
Tax effect 805 10,717 9,607 (11,510)  
Net unrealized holding (losses) gains on investment securities, net (2,493) (33,322) (29,757) 35,711  
Reclassification adjustment for net losses included in net income, gross 232 0 232 52,329  
Tax effect (57) 0 (57) (12,714)  
Reclassification adjustment for net losses included in net income, net 175 0 175 39,615  
Other comprehensive (loss) gain related to unrealized (losses) gains on investment securities, net of taxes (2,318) (33,322) (29,582) 75,326  
Other comprehensive (loss) income, net of taxes (1,978) (33,617) (28,902) 74,737  
Net income 47,915 48,291 88,787 54,089  
Comprehensive income 45,937 $ 14,674 59,885 $ 128,826  
Accumulated Other Comprehensive Loss by Component:          
Unrecognized prior service cost and net actuarial losses on pension and other post-retirement obligations (35,219)   (35,219)   $ (36,118)
Tax effect 8,695   8,695   8,914
Net unrecognized prior service cost and net actuarial losses on pension and other post-retirement obligations (26,524)   (26,524)   (27,204)
Unrealized loss on investment securities (738,122)   (738,122)   (698,990)
Tax effect 178,852   178,852   169,302
Net unrealized loss on investment securities (559,270)   (559,270)   (529,688)
Accumulated other comprehensive loss $ (585,794)   $ (585,794)   $ (556,892)