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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Pension and other post retirement obligations:      
Amortization of actuarial losses included in net periodic pension cost, gross $ 820 $ 651  
Tax effect (197) (159)  
Amortization of actuarial losses included in net periodic pension cost, net 623 492  
Amortization of prior service cost included in net periodic pension cost, gross 15 (29)  
Tax effect (3) 7  
Amortization of prior service cost included in net periodic pension cost, net 12 (22)  
Other comprehensive income related to pension and other post retirement obligations, net of taxes 635 470  
Unrealized gains on available-for-sale securities:      
Net unrealized holding gains arising during period, gross 122,428 23,905  
Tax effect (29,393) (5,832)  
Net unrealized holding gains arising during period, net 93,035 18,073  
Other comprehensive income related to unrealized gains on available-for-sale securities, net of taxes 93,035 18,073  
Other comprehensive income, net of tax 93,670 18,543  
Net income 40,134 41,946  
Comprehensive income 133,804 $ 60,489  
Accumulated Other Comprehensive Income (Loss) By Component:      
Unrealized (loss) for pension and other post-retirement obligations (45,340)   $ (46,175)
Tax effect 11,093   11,293
Net unrealized (loss) for pension and other post-retirement obligations (34,247)   (34,882)
Unrealized gain on available-for-sale securities 155,305   32,877
Tax effect (37,614)   (8,221)
Net unrealized gain on available-for-sale securities 117,691   24,656
Accumulated other comprehensive income (loss) $ 83,444   $ (10,226)