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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net unrealized gain (loss) on cash flow hedges, tax $ (78) $ (120) $ 154 $ 235
Net unrealized gain on investment securities, tax (447) 758 (1,813) 1,102
Adjustments to pension and postretirement plans, tax       (304)
Amortization of pension and postretirement costs, tax $ 2,564 $ 3,442 $ 5,368 $ 6,956