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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension and other post retirement obligations:      
Amortization of actuarial gains (losses) included in net periodic pension cost, gross $ 17,443 $ 8,379 $ (2,563)
Tax effect (4,192) (2,012) 605
Amortization of actuarial gains (losses) included in net periodic pension cost, net 13,251 6,367 (1,958)
Amortization of prior service cost included in net periodic pension cost, gross 200 (471) (115)
Tax effect (48) 113 28
Amortization of prior service cost included in net periodic pension cost, net 152 (358) (87)
Other comprehensive income (loss) related to pension and other post retirement obligations, net of taxes 13,403 6,009 (2,045)
Unrealized gains (losses) on available-for-sale securities:      
Net unrealized holding (losses) gains arising during period, gross (166,007) 87,237 53,988
Tax effect 39,900 (20,943) (13,176)
Net unrealized holding (losses) gains arising during period, net (126,107) 66,294 40,812
Reclassification adjustment for net (gains) included in net income, gross 0 0 (4,882)
Tax effect 0 0 1,194
Reclassification adjustment for net (gains) included in net income, net 0 0 (3,688)
Other comprehensive (loss) gain related to unrealized (losses) gains on available-for-sale securities, net of taxes (126,107) 66,294 37,124
Other comprehensive (loss) income, net of tax (112,704) 72,303 35,079
Net income 189,694 164,676 169,063
Comprehensive income 76,990 236,979 204,142
Accumulated Other Comprehensive (Loss) Income By Component:      
Unrealized (loss) for pension and other postretirement obligations (20,624) (38,267) (46,175)
Tax effect 5,154 9,394 11,293
Net unrealized (loss) for pension and other postretirement obligations (15,470) (28,873) (34,882)
Unrealized (loss) gain on available-for-sale securities (45,893) 120,114 32,877
Tax effect 10,736 (29,164) (8,221)
Net unrealized (loss) gain on available-for-sale securities (35,157) 90,950 24,656
Accumulated other comprehensive (loss) income $ (50,627) $ 62,077 $ (10,226)