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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Pension and other post retirement obligations:          
Amortization of actuarial losses included in net periodic pension cost, gross $ 820 $ 652 $ 1,640 $ 1,303  
Tax effect (197) (160) (394) (319)  
Amortization of actuarial losses included in net periodic pension cost, net 623 492 1,246 984  
Amortization of prior service cost included in net periodic pension cost, gross 16 (29) 31 (58)  
Tax effect (4) 8 (7) 15  
Amortization of prior service cost included in net periodic pension cost, net 12 (21) 24 (43)  
Other comprehensive income related to pension and other post-retirement obligations, net of taxes 635 471 1,270 941  
Unrealized gains on available-for-sale securities:          
Net unrealized holding gains arising during period, gross 7,832 33,547 130,260 57,452  
Tax effect (1,880) (8,189) (31,273) (14,021)  
Net unrealized holding gains arising during period, net 5,952 25,358 98,987 43,431  
Reclassification adjustment for net gains included in net income, gross 0 (4,882) 0 (4,882)  
Tax effect 0 1,194 0 1,194  
Reclassification adjustment for net gains included in net income, net 0 (3,688) 0 (3,688)  
Other comprehensive income related to unrealized gains on available-for-sale securities, net of taxes 5,952 21,670 98,987 39,743  
Other comprehensive income, net of tax 6,587 22,141 100,257 40,684  
Net income 35,248 45,015 75,382 86,961  
Comprehensive income 41,835 $ 67,156 175,639 $ 127,645  
Accumulated Other Comprehensive Income By Component:          
Unrealized (loss) for pension and other post-retirement obligations (44,504)   (44,504)   $ (46,175)
Tax effect 10,892   10,892   11,293
Net unrealized (loss) for pension and other post-retirement obligations (33,612)   (33,612)   (34,882)
Unrealized gain on available-for-sale securities 163,137   163,137   32,877
Tax effect (39,494)   (39,494)   (8,221)
Net unrealized gain on available-for-sale securities 123,643   123,643   24,656
Accumulated other comprehensive income (loss) $ 90,031   $ 90,031   $ (10,226)