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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Pension and other post-retirement obligations:          
Amortization of actuarial (gains) losses included in net periodic pension cost, gross $ (51) $ 290 $ (152) $ 869  
Tax effect 13 (71) 38 (212)  
Amortization of actuarial (gains) losses included in net periodic pension cost, net (38) 219 (114) 657  
Amortization of prior service cost included in net periodic pension cost, gross 112 160 336 480  
Tax effect (28) (39) (84) (117)  
Amortization of prior service cost included in net periodic pension cost, net 84 121 252 363  
Other comprehensive income related to pension and other post-retirement obligations, net of taxes 46 340 138 1,020  
Net unrealized gains on investment securities:          
Net unrealized holding gains on investment securities, gross 44,829 120,681 126,363 81,317  
Tax effect (11,204) (29,452) (31,580) (19,845)  
Net unrealized holding gains on investment securities, net 33,625 91,229 94,783 61,472  
Reclassification adjustment for net losses included in net income, gross 0 255 0 487  
Tax effect 0 (62) 0 (119)  
Reclassification adjustment for net losses included in net income, net 0 193 0 368  
Other comprehensive gain related to unrealized gains on investment securities, net of taxes 33,625 91,422 94,783 61,840  
Other comprehensive income, net of taxes 33,671 91,762 94,921 62,860  
Net income 55,088 43,901 156,033 132,688  
Comprehensive income 88,759 $ 135,663 250,954 $ 195,548  
Accumulated Other Comprehensive Loss by Component:          
Unrecognized prior service cost and net actuarial losses on pension and other post-retirement obligations (23,125)   (23,125)   $ (23,309)
Tax effect 5,670   5,670   5,716
Net unrecognized prior service cost and net actuarial losses on pension and other post-retirement obligations (17,455)   (17,455)   (17,593)
Unrealized loss on investment securities (573,710)   (573,710)   (700,073)
Tax effect 138,001   138,001   169,581
Net unrealized loss on investment securities (435,709)   (435,709)   (530,492)
Accumulated other comprehensive loss $ (453,164)   $ (453,164)   $ (548,085)