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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension and other post retirement obligations:      
Amortization of actuarial gains (losses) included in net periodic pension cost, gross $ 8,379 $ (2,563) $ (12,647)
Tax effect (2,012) 605 3,087
Amortization of actuarial gains (losses) included in net periodic pension cost, net 6,367 (1,958) (9,560)
Amortization of prior service cost included in net periodic pension cost, gross (471) (115) (1,398)
Tax effect 113 28 340
Amortization of prior service cost included in net periodic pension cost, net (358) (87) (1,058)
Initial projected benefit obligation recognized upon plan adoption, gross 0 0 (775)
Tax effect 0 0 189
Initial projected benefit obligation recognized upon plan adoption, net 0 0 (586)
Other comprehensive income/(loss) related to pension and other post retirement obligations, net of taxes 6,009 (2,045) (11,204)
Unrealized gains/(losses) on available-for-sale securities:      
Net unrealized holding gains (losses) arising during period, gross 87,237 53,988 (39,894)
Tax effect (20,943) (13,176) 9,700
Net unrealized holding gains (losses) arising during period, net 66,294 40,812 (30,194)
Reclassification of other comprehensive income due to change in accounting principle - equity securities 0 0 (208)
Reclassification adjustment for net (gains) included in net income, gross 0 (4,882) 0
Tax effect 0 1,194 0
Reclassification adjustment for net (gains) included in net income, net 0 (3,688) 0
Other comprehensive gain (loss) related to unrealized gains/(losses) on available-for-sale securities, net of taxes 66,294 37,124 (30,402)
Other comprehensive income (loss), net of tax 72,303 35,079 (41,606)
Net income 164,676 169,063 168,641
Comprehensive income 236,979 204,142 127,035
Accumulated Other Comprehensive Income/(Loss) By Component:      
Unrealized (loss) for pension and other postretirement obligations (38,267) (46,175) (43,497)
Tax effect 9,394 11,293 10,660
Net unrealized (loss) for pension and other postretirement obligations (28,873) (34,882) (32,837)
Unrealized gain (loss) on available-for-sale securities 120,114 32,877 (16,229)
Tax effect (29,164) (8,221) 3,761
Net unrealized gain (loss) on available-for-sale securities 90,950 24,656 (12,468)
Accumulated other comprehensive income (loss) $ 62,077 $ (10,226) $ (45,305)