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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net Income $ 11,412 $ 12,260
Other comprehensive income (loss), net of tax:    
Amortization of actuarial losses, net of taxes of ($41) and ($64) for the three months ended March 31, 2018 and 2017, respectively. 91 87
Amortization of prior service credits, net of taxes of $3 and $4 for the three months ended March 31, 2018 and 2017, respectively. (7) (7)
Net unrealized (losses) gains on securities, net of taxes of $3,055 and ($811) for the three months ended March 31, 2018 and 2017, respectively. (6,640) 1,148
Net unrealized gain on cash flow hedges, net of taxes of ($2,604) for the three months ended March 31, 2018. 5,661
Total other comprehensive income (loss), net of tax (895) 1,228
Comprehensive income $ 10,517 $ 13,488