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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net unrealized gain (loss) on cash flow hedges, tax $ 162 $ 353
Net unrealized gain on investment securities, tax (1,366) 344
Adjustments to pension and postretirement plans, tax (304) (304)
Amortization of pension and postretirement costs, tax $ 2,803 $ 3,517