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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Pension and other post retirement obligations:          
Amortization of actuarial losses included in net periodic pension cost, gross $ 220 $ 911 $ 440 $ 1,822  
Tax effect (53) (219) (107) (438)  
Amortization of actuarial losses included in net periodic pension cost, net 167 692 333 1,384  
Amortization of prior service cost included in net periodic pension cost, gross 109 50 218 100  
Tax effect (27) (12) (53) (24)  
Amortization of prior service cost included in net periodic pension cost, net 82 38 165 76  
Other comprehensive income related to pension and other post-retirement obligations, net of taxes 249 730 498 1,460  
Unrealized (losses) gains on available-for-sale securities:          
Net unrealized (losses) gains arising during period, gross (260,180) 80,074 (618,939) (147,353)  
Tax effect 63,198 (19,247) 150,341 35,416  
Other comprehensive (loss) income related to unrealized (losses) gains on available-for-sale securities, net of taxes (196,982) 60,827 (468,598) (111,937)  
Other comprehensive (loss) income, net of tax (196,733) 61,557 (468,100) (110,477)  
Net income 39,805 47,944 86,860 100,794  
Comprehensive (loss) income (156,928) $ 109,501 (381,240) $ (9,683)  
Accumulated Other Comprehensive Loss By Component:          
Unrealized loss for pension and other post-retirement obligations (19,966)   (19,966)   $ (20,624)
Tax effect 4,994   4,994   5,154
Net unrealized loss for pension and other post-retirement obligations (14,972)   (14,972)   (15,470)
Unrealized loss on available-for-sale securities (664,832)   (664,832)   (45,893)
Tax effect 161,077   161,077   10,736
Net unrealized loss on available-for-sale securities (503,755)   (503,755)   (35,157)
Accumulated other comprehensive loss $ (518,727)   $ (518,727)   $ (50,627)