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TAX EFFECT ALLOCATED TO EACH COMPONENT OF OTHER COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Income and Comprehensive Income      
Adjustment of pension and postretirement benefit plans $ 8,203 $ 6,044 $ 3,301
Amortization of net losses of pension and postretirement benefit plans (8,817) (8,401) (8,744)
Amortization of prior service credit of pension and postretirement benefit plans 0 1,354 1,482
Unrealized holding gains (losses) on debt securities arising during the period (20,113) 219 4,861
Other-than-temporary impairment included in net income 0 0 (1,559)
Reclassification adjustment for gains included in net income (4) 0 17
Unrealized holding gains on equity securities arising during the period 0 0 (30)
Reclassification adjustment for gains included in net income 0 0 50
Unrealized net (losses) gains on cash flow hedges 1,302 (210) 505
Reclassification adjustment for net losses (gains) included in net income (1,496) 433 (736)
Income tax (expense) benefit $ (20,925) $ (561) $ (853)