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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Pension and other post retirement obligations:          
Amortization of actuarial losses included in net periodic pension cost, gross $ 911 $ 820 $ 1,822 $ 1,640  
Tax effect (219) (197) (438) (394)  
Amortization of actuarial losses included in net periodic pension cost, net 692 623 1,384 1,246  
Amortization of prior service cost included in net periodic pension cost, gross 50 16 100 31  
Tax effect (12) (4) (24) (7)  
Amortization of prior service cost included in net periodic pension cost, net 38 12 76 24  
Other comprehensive income related to pension and other post retirement obligations, net of taxes 730 635 1,460 1,270  
Unrealized gains (losses) on available-for-sale securities:          
Net unrealized holding (losses) gains arising during period, gross 80,074 7,832 (147,353) 130,260  
Tax effect (19,247) (1,880) 35,416 (31,273)  
Net unrealized holding (losses) gains arising during period, net 60,827 5,952 (111,937) 98,987  
Other comprehensive income (loss) related to unrealized gains (losses) on available-for-sale securities, net of taxes 60,827 5,952 (111,937) 98,987  
Other comprehensive (loss) income, net of tax 61,557 6,587 (110,477) 100,257  
Net income 47,944 35,248 100,794 75,382  
Comprehensive income (loss) 109,501 $ 41,835 (9,683) $ 175,639  
Accumulated Other Comprehensive (Loss) Income By Component:          
Unrealized (loss) for pension and other post-retirement obligations (36,345)   (36,345)   $ (38,267)
Tax effect 8,932   8,932   9,394
Net unrealized (loss) for pension and other post-retirement obligations (27,413)   (27,413)   (28,873)
Unrealized (loss) gain on available-for-sale securities (27,239)   (27,239)   120,114
Tax effect 6,252   6,252   (29,164)
Net unrealized (loss) gain on available-for-sale securities (20,987)   (20,987)   90,950
Accumulated other comprehensive (loss) income $ (48,400)   $ (48,400)   $ 62,077