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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Pension and other post retirement obligations:          
Amortization of actuarial (gains) losses included in net periodic pension cost, gross $ (550) $ 220 $ (1,648) $ 660  
Tax effect 134 (53) 401 (160)  
Amortization of actuarial (gains) losses included in net periodic pension cost, net (416) 167 (1,247) 500  
Amortization of prior service cost included in net periodic pension cost, gross 160 109 480 327  
Tax effect (39) (26) (117) (79)  
Amortization of prior service cost included in net periodic pension cost, net 121 83 363 248  
Other comprehensive (loss) income related to pension and other post-retirement obligations, net of taxes (295) 250 (884) 748  
Net unrealized losses on investment securities:          
Net unrealized holding losses on investment securities, gross (105,326) (301,023) (58,105) (919,962)  
Tax effect 25,630 73,119 14,120 223,460  
Net unrealized holding losses on investment securities, net (79,696) (227,904) (43,985) (696,502)  
Reclassification adjustment for net losses included in net income, gross 0 0 52,329 0  
Tax effect 0 0 (12,714) 0  
Reclassification adjustment for net losses included in net income, net 0 0 39,615 0  
Other comprehensive loss related to unrealized losses on investment securities, net of taxes (79,696) (227,904) (4,370) (696,502)  
Other comprehensive loss, net of taxes (79,991) (227,654) (5,254) (695,754)  
Net income 44,129 48,691 98,218 135,551  
Comprehensive (loss) income (35,862) $ (178,963) 92,964 $ (560,203)  
Accumulated Other Comprehensive Loss By Component:          
Unrealized loss for pension and other post-retirement obligations (42,701)   (42,701)   $ (41,533)
Tax effect 10,516   10,516   10,232
Net unrealized loss for pension and other post-retirement obligations (32,185)   (32,185)   (31,301)
Unrealized loss on investment securities (870,559)   (870,559)   (864,783)
Tax effect 211,051   211,051   209,645
Net unrealized loss on investment securities (659,508)   (659,508)   (655,138)
Accumulated other comprehensive loss $ (691,693)   $ (691,693)   $ (686,439)